I asked about this problem at Firefox forums without success, thought I'd see if someone here might know.
Several Firefox addons have long been installed and fully functioning, but now show up on addon list without "options" or "enable/disable" responding and these addons no longer function (don't appear) in Firefox. Several other addons, some more recently installed, some long installed, still work, e.g., show my IP, stumbleupon, translator. No known settings/configuration changed.
Uninstall still works on all, so I uninstalled the non working addons, got message that they would be uninstalled at next Firefox start. Closed and reopend firefox. D/led and reinstalled same addons from firefox addons url as usual -> no change. Installed but not working, they show up on addon list without "options" or "enable/disable" responding and are not evident anywhere in Firefox.
NONE of the disfunctional addons are listed in "C:\Documents and Settings\<user>\Application Data\Mozilla\Firefox\Profiles\x58aa1h6.default" However, they are all installed, or should be, i.e., they appeared to install, but NONE of the disfunctional addons are present in profiles folder.
ALL of the addons that still work ARE listed in profiles folder. This is the only "profiles" folder under Firefox.
And now, hmmmm.... I just tried d/ling and installing several other addons picked randomly. One did install and works. Three "installed" but do not work in Firefox (no evidence of them at all) and are not in Profiles folder.
Suggestions?
XP, sp2, minimally tweaked, Firefox 2.0.0.4