In case you're still using Filterset.G for your AdblockPlus...
... dump it.
On one of my computers where I recently updated the Adblock Plus advertisement blocking plugin for Firefox, it gave me a note that the Filterset.G causes trouble for the recent versions (slowing down, etc.) and that it hasn't been updated for ages.
For replacement filters look for the "Add Filter Subscription..." item in the Adblock Plus preferences, there are some quite good there.
I personally use some filter subscriptions from http://easylist.adblockplus.com, for me they work quite fine.