Open "about:config"
Create if necessary and set the key to false for:
extensions.checkCompatibility
After you install the plug-in you want, go ahead and set it back to true again. Once it's installed it will start working.
Spell check text boxes too in Firefox
Change the following default settings in Firefox and you should be good to go.
about:config
layout.spellcheckDefault
change 1 -> 2
Turn off Plug-in Compatibility Check for Firefox
You need to install a plug-in you know is compatible, but is failing the check. Create and/or modify the following key in the "about:config" section.
extensions.checkCompatibility
After you have installed and used the plug-in you can turn this back off again; however, the plug-in will become disabled. Just turn off the check again whenever you want to use the failing plug-in.
Backing up Firefox Portable Settings
This is an update of previous notes for pre-3.0 versions. It's untested. I recommend you backup the entire folder just in case.
signons3.txt
key3.db
bookmarkbackups\*.json (for import)
cookies.sqlite
Manual removal of Firefox extension, if normal removal fails
- Open the Firefox profiles folder, which normally located at %AppData%\Mozilla\Firefox\Profiles\xxxxxxxx.default\, where xxxxxx is a random string. User should pick the profile folder (if inside Profiles folder there are multiple sub-folders) that are active, i.e. profile for user account to uninstall the extension.
- Open the extensions folder inside the profile folder.
- Each folder here inside the "extensions" folder corresponds to an extension. Some folders may have readable name that resembles the plugin, extension or toolbar, and can be easily recognized. Often the names of the folders are obscured. To identify which extension or plug-in the folder is representing, go to each folder and perform the following steps:
- Use a text editor to open the install.rdf file inside it.
- Search for the following text: em:name
- Locate the folder with install.rdf file with the name after the "em:name" corresponding to the extension intends to remove or delete.
- Delete the whole folder for the extension.
Firefox keeps asking for proxy credentials
Attempted to change with about:config
Set network.negotiate-auth.allow-proxies to false
Did not quite work, filtered on "proxies" and set everything back to default values.
Also, set all of the "No Proxy" settings for the browser.
Currently this appears to be a networking issue with Firefox. Currently none of my attempts to fix the problem have worked.