See 2.0 Beta Known Issues.

• Drag-and-drop to collections is broken in Firefox 3.0.0 and Debian Iceweasel 3.0.4 (details; non-Debian users can upgrade to the latest version of Firefox 3.0.x to fix)
• File drag-and-drop is broken on Linux

The following Firefox extensions and applications are known to cause “Could Not Save Item” translator errors in Zotero:

• Norton Internet Security — Identity Safe feature (details)
• RealPlayer Browser Record Plugin (details)
• RoboForm 6.9.91 (details; to fix, close the RoboForm application completely from the Windows taskbar, as errors persist even after disabling the Firefox extension)
• Torbutton (fix available for testing)

The following Firefox extensions are known to cause other problems in Zotero:

• Megaupload (details)
• Skype extension (reported in several forum threads but not reproduced by Zotero developers; details)
• Split Browser (details)
• SwitchProxy (details)
• Vista-Aero theme (?v. 3.0.0.29? details)
• Youlicit (details)

The following Firefox extensions previously caused problems in Zotero but have since been fixed to be compatible:

• Bodybuilding.com Toolbar 1.2 (details; fixed in 1.3)
• iMacros 6.0.4.1 (details; fixed in 6.0.5.3)
• NoScript 1.8.7 (details; fixed in 1.8.7.2)