Uninstalled extension data remaining in about:config

[prosecco]

First I installed ABPrime, then I replaced it with UBlock Origin.

However I notice this line in about:config: "extensions.abprime.currentVersion;1.0.7"

I don't think it should be there as I uninstalled ABPrime, but maybe it doesn't do any harm either.

Should I delete tihs line, or leave it?

[Isengrim]

It's normal for extensions to leave behind preferences in about:config, and it's actually beneficial if you decide to reinstall the extension later. However, if you are certain that the preference is controlled by an extension you no longer use and do not wish to use in the foreseeable future, you may delete it.

[billmcct]

You should install this addon to remove all leftover lines in preferences when you uninstall an addon.

https://addons.mozilla.org/en-US/firefo ... uninstall/

You can also use this one to remove leftovers that are there now. I would be careful if you use this.

https://addons.mozilla.org/en-US/firefo ... /ecleaner/

[Nightbird]

First I installed ABPrime, then I replaced it with UBlock Origin.

However I notice this line in about:config: "extensions.abprime.currentVersion;1.0.7"

I don't think it should be there as I uninstalled ABPrime, but maybe it doesn't do any harm either.

Should I delete tihs line, or leave it?

you can remove it if you wish

about:config
right-click on the preference name and select : Reset

now the value is empty and the full line will be removed once PM restarts

[fillerup]

best practice: install the Clean Uninstall addon that bill linked, reinstall your old extensions and then remove them again. this time Clean Uninstall will kick in and delete all the leftover extension-specific configs remaining

[Nightbird]

I don't know if the addon is working with PM 28 but the last version (0.2) has a problem with PM 27 :
https://github.com/rNeomy/clean-uninstall/issues/13

so maybe (if working with PM 28) the version 0.19 would be an easier and better choice for PM
https://addons.mozilla.org/en-US/firefo ... /versions/

edit : you can install v.0.2 easily on PM28

[billmcct]

I don't know if the addon is working with PM 28 but the last version (0.2) has a problem with PM 27 :

I installed 0.2 on August 26 2017 and I have not had any issues with it on either 27 or 28. May be a linux specific issue.