Some of the most common firefox. Class not registered. We are sorry for the inconvenience. Cannot find firefox. Error starting program: firefox. Faulting Application Path: firefox.
The file firefox. Windows failed to start - firefox. How to Fix firefox. Step 1: Restore your PC back to the latest restore point, "snapshot", or backup image before error occurred. In the search results, find and click System Restore. Follow the steps in the System Restore Wizard to choose a relevant restore point. Restore your computer to that backup image.
If the Step 1 fails to resolve the firefox. If this Step 2 fails as well, please proceed to the Step 3 below. In the Windows Update dialog box, click " Check for Updates " or similar button depending on your Windows version If updates are available for download, click " Install Updates ". After the update is completed, restart your PC.
GetGo Download Helper for Firefox. GetGo Download Helper for Chrome. Top Features. Detect and Download web videos. Multi Threaded Download Engine. Pause and Resume broken downloads. Easy Batch Download. More Features. Change Log. Bug fix. Version 6. Version 5. Fixed the Global Speed display bug. Fixed UI bugs under lower screen resolution!! Fix command line bugs of starting up from addons. Fixed some GetGo 4 bugs. Version 4. Fixed download using Proxy with username and password authentication!!
Firefox Integration now supports multi-languages o Updated with new version of Ask Toolbar!! Indicates whether the user is currently online. True default : User is online False : Opposite of the above. Determines whether to use link prefetching. True default : Silently prefetch hinted documents and store in the cache False : Disable all link prefetching. The path and program to run for the specified protocol. Note: To set up a new protocol, it must be registered. See here for more information.
Determines whether to expose enable all protocol handlers. This preference overrides more specific preferences, e. True : Try to open link clicks in browser first, then fail over to system handlers False : Do not expose all protocol handlers. Determines whether to expose enable the specified protocol handler. These preferences are overridden by network. True : Try to open link clicks in browser firsst, then fail over to system handlers False : Do not expose this protocol handler.
Determines the default action for unlisted external protocol handlers True default : Try to load False : Opposite of the above. Determines whether to allow external protocol handlers to catch links with these protocols True : Allow external handler to handle link False default : Prevent external handler from handling this link.
Determines whether to warn the user before loading an unlisted external handler True default : Warn the user False : Opposite of the above. Determines whether to warn the user before loading this protocol's external handler True : Warn the user False default : Opposite of the above. The automatic proxy configuration URL used by the browser to determine a proxy server.
Used when network. Determines how long to wait until re-contacting an unresponsive proxy server. Default value is 30 minutes. A manually configured proxy for the given protocol.
The port for the manually configured proxy for the given protocol. A comma-and-space-delimited list of hosts for which the specified proxies should not be used. See No proxy for for syntax. Determines whether to use the same proxy server for all protocols. The only other valid version is 4. Determines how the browser uses proxies. A comma-separated list of port numbers to disable in addition to the ports already disabled by default.
See Mozilla Port Blocking for more information. A comma-separated list of port numbers to enable, overriding the default port blocking. Force a compatibility mode instead of autodetecting. True default : Verify that the checksum of the XUL Fastload file hasn't changed since that file was last written to disk False : Don't bother verifying the checksum.
False default : Cache XUL components for better performance. True : In debug-enabled builds, output event-related information to stdout when Caps Lock is on False default : Opposite of the above.
True : In debug-enabled builds, output information about paint events to stdout when Caps Lock is on False default : Opposite of the above. Determines time in milliseconds to wait before an initial reflow attempt during page rendering.
Synchronize with content. The maximum number of pages that may be retained in the database before starting to expire. Default value is calculated on startup and put into the places.
If this preference does not exist, places. You cannot change this value, and it will be used in the absence places. It is helpful a helpful starting point for setting places. True default : When a plugin is needed, prompt the user False : Don't prompt the user to install needed plugins. MIME types that would normally be opened with a plugin, except that the action has been changed in the Firefox Download Actions window.
Resetting this preference changes the download action back to the plugin. True : In about:plugins and navigator. Controls the scanning of the Navigator 4. When this preference is missing, the default is to pickup popular plugins such as Flash, Shockwave, Acrobat, and Quicktime. If set to true, ALL plugins will be picked up and if set to false the scan will not happen at all. Name of plugin to scan for, with a minimum version specified. By default, this preference exists for Acrobat 5. True default : Extend the native dialog with information on printing frames.
False : Opposite of the above Note: Firefox 1. False : Disable the system. Determines the distance from the position edge of the page to measure the margin. True default : Save the print settings after each print job False : Opposite of the above.
True default : Show the progress dialog when printing False : Opposite of the above. True default : Every browser window uses the same print settings False : Each browser window uses its own settings, and changes in one window don't affect the others.
True default : Clear history of downloaded files when using the Clear Private Data feature Firefox 1. Sets limits on popups generated from plugins e.
Flash 0 : lets all popups through 1 : limits their number to dom. Whitelisted sites will still be able to open popups, regardless of this setting. True default : The user has never hidden the popup blocker notification bar before, so show a dialog explaining the status bar icon False : The user has been informed of the status bar icon.
Determines the popup blocker behavior. True default : Display a message at the top of the browser window when a popup has been blocked False : Display a status bar icon to indicate when a popup has been blocked. Determines how the Profile Manager handles automigration of Netscape 4. True default : Ask user before performing an automigration False : Opposite of the above. Determines how the profile root is set.
Number of seconds to wait until the profile is considered defunct. Default value is -1 never consider the profile defunct. URL and security. Determines the name of the OCSP signing certificate authority to use if security. Determines when Mozilla Mail should ask for the master password. Pref removed use CAPS instead. Previously: Determines how to handle access across schemes e. Determines the selection of a security certificate to present to web sites that require one.
Amount of time in milliseconds to disable buttons on security-sensitive dialog boxes. True default : SSL 3. True default : TLS 1. Determines how long in minutes to go without asking for the master password in Mozilla Mail when security. True default in all except the two below : The SSL 2. True default : Display a dialog warning the user when entering a secure site from an insecure one False : Opposite of the above. True default : Leave the "Alert me whenever True default : Display a dialog warning the user when entering an insecure site from a secure one False : Opposite of the above.
True default : Display a dialog warning the user when leaving a secure site False : Opposite of the above. True default : Display a dialog warning the user when submitting a form to an insecure site False : Opposite of the above.
True default : Display a dialog warning the user when a page has both encrypted and non-encrypted content False : Opposite of the above. True default : Allow scripting of plugins by untrusted scripts False : Opposite of the above.
True default : Allows auto-filling of stored usernames and passwords on webpage forms False : Opposite of the above Added in Firefox 1. Determines the filename that the Password Manager uses for storing signon data. Default value is signons. Determines the filename that the Password Manager uses for storing signon data starting in Firefox 1.
Default value is signons2. True : The master password for the Password Manager will expire False default : Opposite of the above. When calculating distances between elements on the screen, elements may be given a bias if the elements are in the direction of navigation. The default value is 3.
True default : Disable onFocus event that an element may recieve during spatial navigation. On some pages the page decides to move the focus as if the targeted content was clicked. This may lead to an undesirable behavior. False : Honor onFocus handlers triggered by spatial navigation.
True default : Ensure that text fields and inputs retain focus even if spatial navigation was requested False : Opposite of the above. Determines the key code corresponding to downwards spatial navigation. Determines the key code corresponding to left spatial navigation. Determines the key code corresponding to the required modifier keys. Determines the key code corresponding to right spatial navigation. Determines the key code corresponding to upwards spatial navigation.
To reduce the chance that a element overlaps with another element, we reduce the elements height and width by this value. Determines how much of the text to search for matched text, specified as the number of characters from the beginning. Determines how many milliseconds to wait before scrolling the tab strip by another increment.
Default: True default : Scroll the tab strip smoothly to a newly-selected tab. False : Move to the new tab immediately. Specify the SQLite disk sync mode to use. Specify the zoom levels as multipliers that the user can use on content. Determines which file picker to use True default : use the OS's standard picker if available False : Use a XUL file picker styled by your current theme, even if your OS provides its own.
Determines the key code corresponding to the accelerator key. Determines the key code corresponding to the generic key used for Mozilla shortcuts -1 default in recent builds Use ui.
True default in Windows : Menus gain focus when ui. Determines the delay in milliseconds between hovering over a menu option with a submenu and the submenu appearing. If this preference is not set, the OS's value is used.
Determines the background color to use for text selections as a hex code or named color. Determines the background color used for Find As You Type as a hex code or named color. If this preference is not set, the inverse of ui. Determines the text color to use for text selections as a hex code or named color. Determines how often to check extensions. Default value is 1 hour. Used by the update system to determines when to display the icon for pending updates. True default : Display the sliding alert when updates are available False : Opposite of the above.
True default : Display a notification in the browser when updates are available False : Opposite of the above. Determines where to get update notifications. False default : The internal viewer should be used when View Source is requested.
If the path doesn't exist or isn't a program, the internal viewer will always be used. True default : Enable syntax highlighting in the view source window.
Already open windows aren't updated implemented in bug in trunk builds mozilla True : HTML code will wrap in the view source window.
False default : HTML code will not wrap in the view source window. Determines the chrome location of the XPInstall dialog. Determines the chrome location of the extensions dialog. Determines the chrome location of the themes dialog. True default : Enables the XPInstall system i. A comma-separated list of sites to automatically add to the extensions whitelist.
Default value is update. True default : When installing extensions from remote hosts, remote host must be on the whitelist False : Opposite of the above. These preferences are set via the All in One Mouse Gestures extension.
True : When a plugin is not found, clicking on the puzzle piece will open a dialog telling the user what plugin is needed. Clicking on the "Get the Plugin" button brings the user to the plugins installation page. False default : Clicking on the puzzle piece will send the user to that plugin's page on plugins. Previously: number of backup copies of prefs. Custom name for the Personal Toolbar Folder. If empty default , name is determined by string bundle or the hard-coded value "Personal Toolbar Folder".
Full path to an ICM profile for output. Default is an empty string in which case the systems global profile is used. If no global profile can be found a default sRGB profile is used. True : Enable color management for rendered graphics. False default : Disable color management. Obsolete since See gfx. When to use color management for graphics: 0 : Never 1 : Always 2 : Only for tagged images default. Determines how to animate multi-frame GIF images none : animated images will never play.
Whether to dither images auto default : Automatically decide true : Dither images false : Disable image dithering. Determines how an IME editor window should react when password fields lose focus see bug Determines how an IME editor window should react when password fields gain focus see bug These entries apply to the DOM Inspector and are only relevant if you have it installed.
URL to use for keyword lookups. Default value in Firefox 2. URL False : Disable keywords. See Change the Date Format. Determines where the plugin finder service should query for plugin information. These prefs are used for the frecency calculation process.
A comma-separated list of files that will be selected for roaming by default. If you visit a Widevine-enabled page when this setting is disabled, Firefox will display a prompt below the address bar asking for permission to install DRM. Approve this and then wait for the "Downloading" bar to disappear, you are now able to watch videos from Widevine protected sites. Firefox can only play p video or lower with Widevine, due to not using hardware DRM playback. It is also required that the private mode browsing is disabled, for the window and in the preferences.
Firefox can use system-wide installed Hunspell dictionaries as well as dictionaries installed through its own extension system. To enable spell checking for a specific language right click on any text field and check the Check Spelling box.
To select a language for spell checking to you have right click again and select your language from the Languages sub-menu. When your default language choice does not stick, see Firefox does not remember default spell check language.
Install Hunspell and its dictionaries for the languages you require. To get more languages right click on any text field and just click Add Dictionaries If a dark GTK theme is in use e. Arc Dark , it is recommended to start Firefox with a brighter one e. Alternatively, starting with Firefox 68 you can make all the Firefox interfaces and even other websites respect dark themes, irrespective of the system GTK theme and Firefox theme.
To do this, set ui. If Firefox is unable to automatically detect the right value, it will default to 60 fps. To manually correct this, set layout. To prevent pages from abusing memory and possible OOM , we can use Firejail with the rlimit-as option. To control where new tabs appears relative or absolute , use browser.
See [26] for more information. You can Take a Screenshot by either clicking the Page actions button the three horizontal dots in the address bar or by right-clicking on the webpage. See [27] for more information. As an alternative you can use the screenshot button in the Developer Tools. More recent versions of Firefox support opting into Wayland mode via an environment variable. To make this permanent, see Environment variables Graphical environment and start Firefox via the desktop launcher like you normally would.
To verify it worked, look for Window Protocol in about:support. It should say wayland. The presence of x11 means you are running Firefox under Xorg display server, while xwayland means your system is running Wayland but executing Firefox as legacy X11 application.
On native Wayland, Firefox rendering performance can be significantly improved by setting gfx. As of Firefox 89, this feature is experimental and Firefox Nightly is recommended for testing.
All rendering is allowed to occur in native compositor surfaces, resulting in more efficient rendering, improving performance and battery life [28]. GNOME To have multiple tabs opened when starting Firefox open a new window and then open the sites you want to have as "home tabs". The command line switch --safe-mode starts Firefox in Safe Mode , which disables extensions, themes and some other features for this session. To force disable hardware video acceleration in Firefox, e.
By default extensions will not affect pages designated by extensions. See Network configuration Local network hostname resolution on how to set it up. Firefox has a setting which determines how many replacements it will allow from Fontconfig. To allow it to use all your replacement rules, change gfx. Firefox ships with the Twemoji Mozilla font.
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