Hi Raven

What is the bookmark that you are trying to delete? Is there any error message when you try to delete it?

I tried to delete many bookmarks. It's not working at all. No error message just nothing happens.

Can you delete it from within the Bookmark Manager?

No, I tried it.

If you can't add a bookmark either, Firefox may be having trouble accessing the Places database. Sometimes, this also is blamed on Sync.

As a first step, if you haven't already, please do a normal shutdown and/or restart of your system. Restarting Windows can help by freeing up locked files, completing any deferred updates, and resolving temporary file permission issues.

Any improvement?

If Firefox still has bookmark problems (unable to add or delete), could you let us know what you get when you run the "Verify Integrity" diagnosis and repair function. That's here:

Open Firefox's Troubleshooting Information page using any of these methods:

• "3-bar" menu button > Help > More Troubleshooting Information
• (menu bar) Help > More Troubleshooting Information
• type or paste about:support in the address bar and press Enter

Near the bottom, there is a section titled Places Database -- that's the file which stores history and bookmarks. Click the button labeled Verify Integrity. There may be a 10-15 second delay before results appear.

If all is well, the report that appears below the button should start with:

> Task: checkIntegrity
+ The places.sqlite database is sane
+ The favicons.sqlite database is sane
> Task: invalidateCaches
+ The caches have been invalidated
> Task: checkCoherence
+ The database is coherent

Does yours say the databases are sane, or something else? You can select and copy the report, and then paste it into a reply for review and comment.