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There are two incompatible addons in my addons list that the Uninstall button is disabled for. They were working well in Firefox 3.5, but upon installing Firefox 3.6 they became incompatible.

The first one is PC Sync 2 Synchronisation Extension:

PC Sync 2 Synchronisation Extension

The second one is Firefox Synchronisation Extension:

Firefox Synchronisation Extension

How can I uninstall them?

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up vote 2 down vote accepted

Some programs install global add-ons (available to all users of Firefox on your computer) for Firefox. Because these aren't local add-ons (installed by you for use on your Firefox profile), you can't uninstall them in the usual manner. Most global add-ons are installed either by copying the extension to C:\Program Files (x86)\Mozilla Firefox (or equivalent directory); or by making registry entries. Please read this article carefully as it provides details on how to remove global add-ons.

If your intention is to make these plugins work with FF3.6 (rather than removing them), you can disable compatibility checking.

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Thanks friend, If I disable compatibility checking, will Firefox work as well as before ? – Mohammad Dayyan Mar 20 '10 at 14:53
If the plugins isn't too old (like 12 months or older), they should work fine. You can disable compatibility checking and try it out. If things don't work out, just set compatibility checking to "true" and restart Firefox; this will bring you back to default settings. – George P. Burdell Mar 20 '10 at 15:24

Another alternative is to edit the version range these extensions claim compatibility with. This is assuming they really do work but that their compatible-version range hasn't been updated to include the latest Firefox version, but this is often the case. The advantage is that compatibility checking remains enabled to check any new extensions you add later.
See the second tip in this article:

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