I confirm this bug, which has occurred for a few months. The bug was reported as Mozilla bug 291278 (but no mention to tabextensions).
https://bugzilla.mozilla.org/show_bug.cgi?id=291278 -- Vincent Lefèvre <[EMAIL PROTECTED]> - Web: <http://www.vinc17.org/> 100% accessible validated (X)HTML - Blog: <http://www.vinc17.org/blog/> Work: CR INRIA - computer arithmetic / SPACES project at LORIA -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
