I have just made version 1.1 of Encrypted Bookmarks for Firefox available. The only change is that maxVersion was bumped to 4.0b3, so that those using Firefox 4.0b3 can continue encrypting their bookmarks.
I also fixed the download link on the Encrypted Bookmarks installation page. Being a twit, I’d typed https, rather than http, for the installation link to the .xpi. It’s fixed now 
If you use Firefox and would like to give the Encrypted Bookmarks for Firefox add-on a try, you can get it here.