I thought I’d put up this short post because I was having problems with this last week.
For whatever reason, Firefox would not update automatically through its update channel and was still stuck on version 9.0. So, I figured why not just manually install it?
When trying to update it, as usual, I dragged it into the Applications folder and tried to replace my existing one. Only to get this message:
The operation can’t be completed because you don’t have permission to access some of the items.
I unlocked the Firefox.app file and made sure I had proper permissions, but still got that error. When I wanted to look up a solution, my Firefox had ceased to work!
After much searching, I finally found a thread on the Firefox support forums that provided the simple solution: delete the old app (just the .app, don’t use an app cleaner) then drag the new one in.
I would’ve reported it, but I can’t seem to reproduce the problem now… maybe they fixed it.