>>876
Oh, I sort of do have a recourse. What I did was:
1. go into my FF profile (application data\mozilla\firefox\profiles\gobbledygook.default)
2. find 4chan_boards.xml
3. make a backup
4. opened it in notepad++ and deleted all the boards I didn't want and saved it
5. made the file read only
When I opened FF, it gave an error about not being able to write the file, but the menu works and only has the files I left in it. So it's sort of a ticky-tacky fix and I have to find and destroy the line in 4chan.js (I think) to make it quit trying to download its own version of 4chan_boards.xml on startup, but it's better than seeing the whole board list when I open the menu.