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incompatibility nonsense Rated 5 out of 5 stars
Turn off compatibility tests and reinstall from the "View Older Versions" link.
This extension works fine in all versions of Firefox, both with the toolbar button and with the keyboard shortcut (Ctrl+Shift+Z). Shame people think they have to find a substitute. Perhaps the "Add-on Compatibility Reporter" reporting in Firefox Betas will restore some sanity to the ongoing lunacy about incompatible extensions. Meanwhile see http://www.mvps.org/dmcritchie/firefox/infolister_listing.htm#compatibilitydisabled