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A few people have reported the inability to install scripts, on OS X and GM 0.9.1:
As pointed out in one of those threads, I cannot reproduce. Another extension incompatibility?
I am experiencing the same problem, OS X 10.6.6, Firefox 3.6.14. I've tried disabling all other extensions, to no avail.
When I press the 'Install' button, the script is actually downloaded and installed, but the dialog is never closed. Thus, I still am presented with the option of "Install" or "Cancel". If I press Cancel (or the Escape key), the script file is then removed from my gm_scripts directory.
If I kill Firefox will the dialog is still up, and then restart, the script is installed and working.
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:220.127.116.11) Gecko/20110218 Firefox/3.6.14
Error: uncaught exception: [Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIAlertsService.showAlertNotification]" nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)" location: "JS frame :: file:///Users/gaudio/Library/Application%20Support/Firefox/Profiles/amazon00.default/extensions/%7Be4a8a97b-f2ed-450b-b12d-ee082ba24781%7D/modules/GM_notification.js :: GM_notification :: line 22" data: no]
To those experiencing this bug, installing Growl ( http://growl.info/ ), or making sure it is running (System Preferences, Other, Growl) should help until there is a permanent fix.
I've heared about it too, always firefox 3.6 and mac and greasemonkey 0.9.1
(and about 4 users complained out of 1000 total, I think it's pretty common)
This is ultimately a dupe of #1264