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Remove an individual add-on's data?

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How do you remove an add-on's data without clearing all your add-on's data? I have already tried this: https://support.mozilla.org/en-US/kb/cannot-remove-add-on-extension-or-theme and this: https://support.mozilla.org/en-US/questions/1117690 trying both still resulted in the add-on still having it's data when I reinstalled it.

Chosen solution

The extensions folder stores the XPI files from installed extensions. The prefs.js files stores all Firefox preferences that do not have the default value. The prefs.js file is a text file, so you can edit this file with a text editor like Notepad.

Did you open the about:config page via the location/address bar to check for user set (bold) prefs from extensions that you have removed?

Resetting prefs on the about:config page via the right-click context menu to the default value might be safer in your case to remove no longer used prefs.

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All Replies (4)

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If you uninstall (remove) an extension then you only remove the extensions xpi file and not the data that this extension stores in a file or folder in the profile folder.

Is this data stored in a special folder or file in the Firefox profile folder or is this data stored as (extensions) prefs in the prefs.js file?

In case of the latter you need to remove the corresponding lines from prefs.js or reset the prefs on the about:config page.

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

You can use this button to go to the current Firefox profile folder:

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cor-el said

If you uninstall (remove) an extension then you only remove the extensions xpi file and not the data that this extension stores in a file or folder in the profile folder. Is this data stored in a special folder or file in the Firefox profile folder or is this data stored as (extensions) prefs in the prefs.js file? In case of the latter you need to remove the corresponding lines from prefs.js or reset the prefs on the about:config page. You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue. You can use this button to go to the current Firefox profile folder:

I'm not sure, there is a folder for it in extensions folder and a folder in the profile folder but deleting those still kept it's data. How do I edit the prefs.js file?

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Chosen Solution

The extensions folder stores the XPI files from installed extensions. The prefs.js files stores all Firefox preferences that do not have the default value. The prefs.js file is a text file, so you can edit this file with a text editor like Notepad.

Did you open the about:config page via the location/address bar to check for user set (bold) prefs from extensions that you have removed?

Resetting prefs on the about:config page via the right-click context menu to the default value might be safer in your case to remove no longer used prefs.

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cor-el said

The extensions folder stores the XPI files from installed extensions. The prefs.js files stores all Firefox preferences that do not have the default value. The prefs.js file is a text file, so you can edit this file with a text editor like Notepad. Did you open the about:config page via the location/address bar to check for user set (bold) prefs from extensions that you have removed? Resetting prefs on the about:config page via the right-click context menu to the default value might be safer in your case to remove no longer used prefs.

Thank you, it worked!