Re: FF3.5 hijack issue with search and bookmarks toolbar
Well just delete the bookmarks and as for the unwanted search engine did you use the searchbox dropdown to Manage Search Engines then remove the one you do not want?
Also in the Fx searchplugins folder located in the Profile Folder you can delete the Ask.com search plugin.
Edit* You should have a backup or two of your bookmarks in your Profile Folder bookmarksbackup folder.
Use the Bookmark Manager to restore one of those backups dated before this happened. -- "Facts not FUD!"
This is very odd, I installed the upgrade the same way as the OP and had none of this happen. If it was across the board, I'm sure there would be a lot of people here complaining about it.
I too wonder about other installed software or maybe some hijacking? -- You can chain my body to the earth, but still my spirit flies!