Firefox for MAC cannot install add-on (extension). MAC OS X
Firefox for MAC OS X. You experiencing problems with installing add-on? You can find solution inside.
If you are using Firefox and decide to install Add-ons you can get error message “There was an error downloading add-on” or something like this. Most likely it was caused by permissions on your Firefox permissions.
This kind of error can be resolved very easy. Launch the Terminal (/Applications/Terminal). Enter the following command :
cd ~/Library/Application Support/Firefox/
than enter following command
you will get something like this:
Your default profile location will be “l6l67q85.default“. In your profile you should look for folder called extensions. To check what is going on with this folder, enter
ls -ld Profiles/l6l67q85.default/extensions
Your system output will looks like this:
drwx——@ 6 nukem staff 204 Mar 25 16:10 Profiles/l6l67q85.default/extensions
You need to change permissions to allow group and others to read and write to this folder.
chmod -R go+rw Profiles/l6l67q85.default/extensions/*
It will change permissions on everything in extensions folder.