Torbutton (incorrectly) prevents reloads.
I sometimes get messages like "[11-18 16:20:00] Torbutton NOTE: NO ORIGIN! Blockng request for: [scrubbed]" in the Firefox error console when I try to reload or navigate through tab history, though navigating through the use of links still works. Also, other extensions are unable to reload tabs. This bug appears to be linked to specific tabs, and persists through (but isn't caused by) a TorButton toggle.
Trac:
Username: katmagic