Hello,

What happens if you try the Bookmarks sidebar?

• Click > Bookmarks > View Bookmarks Sidebar

Are you able to edit your bookmarks there?

You can also Try Firefox Safe Mode to see if the problem goes away. Firefox Safe Mode is a troubleshooting mode that turns off some settings, disables most add-ons (extensions and themes).

If Firefox is open, you can restart in Firefox Safe Mode from the Help menu:

• Click the menu button , click Help and select Restart with Add-ons Disabled.

If Firefox is not running, you can start Firefox in Safe Mode as follows:

• On Mac: Hold the option key while starting Firefox.

When the Firefox Safe Mode window appears, select "Start in Safe Mode".

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one. Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article to find the cause.

To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

When you figure out what's causing your issues, please let us know. It might help others with the same problem.

Have you tried <Control><Shift> B ?

Cory MH - Thank you for your suggestions. The bookmarks window DOES open when Firefox is in safe mode. So I went through the troubleshooting process and nothing there helped. Extensions (there are only two) are disabled, I am using the default appearance. All plug-ins are set on "ask to activate". I should mention that this bookmark problem only just began, and never happened before the most recent updates - there were two only a day or so apart.

Problems with bookmarks and history not working properly can be caused by a corrupted places.sqlite database file.

Type about:support in the address bar and press enter.

Under the page logo on the left side you will see Application Basics. Under this find Profile Folder. To it’s right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.

Locate the file. Then rename or delete it. Restart Firefox.

Fred McD - Thank you for both your suggestions. Unfortunately, neither resolved the issue.

You can check for problems caused by a corrupted localstore.rdf file.

• http://kb.mozillazine.org/Corrupt_localstore.rdf

You can try to disable hardware acceleration in Firefox.

• Firefox > Preferences > Advanced > General > Browsing: "Use hardware acceleration when available"

You need to close and restart Firefox after toggling this setting.

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
• https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

Cor-el - Thanks for your reply. Unfortunately your suggestions did not work. I have already previously turned off the acceleration and the localstore replacement had no effect on the difficulty either.

I'm not a programmer, but since this problem has only started since recent updates, is it possible that a coding omission was made? I've just checked through the items in the pull down menu and this problem also occurs (no window opening) when I click "Show all history", "downloads", and "library". I don't know what "library" is, but it behaves the same way as the other menu items. They all react to the command, dim the pull-down menu bar, but show nothing. Additionally, if I use the bookmarks toolbar to try and show all bookmarks, this dims the menu bar and a window does not open from there either. To be clear, I am talking about the window that should open displaying the bookmark titles, URLs and other info.

Well, this problem just resolved itself!

I have two monitors that I use both for certain work functions. The second is usually turned off when not in use. After completing my last post, I turned on that monitor and there was the missing window. I'm not sure why it would display on the secondary monitor since all other windows were opening on the primary, but I moved it over and now all is working as it should.

Thanks to all who offered troubleshooting suggestions. I greatly appreciate your help.

ptc051Hello,

I am glad to hear that your problem has been resolved. If you haven't already, please select the answer that solves the problem. This will help other users with similar problems find the solution more easily.

Thank you for contacting Mozilla Support.

Good to hear. A number of users have reported problems with multiple monitors.

Please flag your last post as Solved Problem so others will know.