Adblock Plus

Yesterday I was watching South Park online and I thought I already had Ad Blocker Plus installed. It's been a while since I've watched anything online, so I figured maybe it was just an old version of Ad Blocker, or something, but today I go on to watch South Park again and the Ad Block Plus which I just installed yesterday has magically disappeared from my Add Ons. Not sure what is going on. Do I seriously have to reinstall Ad Block Plus every time I open Firefox?

could be your profile is corrupted
create a new one (save first your passwords, bookmarks)

http://kb.mozillazine.org/Creating_a_ne ... on_Windows

If this issue should keep occurring with a clean profile, please report it in more detailed means at https://issues.adblockplus.org

Of course, you should not be required to reinstall ABP at each browser restart.