In firefox 4 RC, some addons installed suddenly disappear, but checking the profile, some of the missing addons related files are still here, how to make the addons back?

I use firefox 4 form beta 9 to RC (zh) now and there are also firefox 3.6 installed in computer. One day when I open Fx 4 RC, some (actually a lot but not all) of the adoons just disappear. When I check on about:addons page, some addons installed do not appear in the list.
The addons '''REMAINED''' including:
* addons I already used in Fx 3.6 (like webmail notifie , xmarks)
* ''addons only can use in Fx 4'' (like Open Web Apps for Firefox).
The addons '''DISAPPEARED''' including:
* addons I already used in Fx 3.6 (like yoono)
* '' addons installed when using Fx 4'' (like updatescanner, Thumbnail Zoom).
But when I check the profile(by Help > Troubleshooting Information>Open Containing Folder) , some (not sure is it all) of the missing addons related files are still here [lucky], so any one know how to make the missing addons back?
Some more details:
* This happened when i use RC for already a few days and keep on even i restart Fx and windows.
* The bookmarks, history, search engine and even themes and icon setting are still here. [ I only sync bookmarks but not history for both xmarks and firefox sync.]
* This addons are really '''disappeared''' but not disable only!
* This number of addons missed, as i remember, at least 30, should be more than that number bacause some of them are installed but in disable mode.
* I try to install back one of the addons - Stylish, the installed code are still here.
* It is nearly an impossible mission to install every missing addons again, as it really kill my time.

Delete the files extensions.* (extensions.rdf, extensions.cache, extensions.ini, extensions.sqlite) and compatibility.ini in the Firefox [[Profiles|profile folder]] to reset the extensions registry. New files will be created when required.
See "Corrupt extension files": http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the Tools button at the left side of the Search Bar to do a compatibility check.

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