Hello,

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

1. Go to Firefox > Help > Troubleshooting Information.
2. Click the "Reset Firefox" button.
3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
4. Firefox will open with all factory defaults applied.

Further information can be found in the Refresh Firefox - reset add-ons and settings article.

Did this fix your problems? Please report back to us!

Thank you.

Are you sure that you are opening the Bookmarks sidebar and aren't using the Bookmarks Menu button that show the bookmarks in a drop-down list?

Firefox has two bookmark buttons with a star in the Customize window.
One star button has a drop-marker that open the Bookmark menu and may appear on the Navigation Toolbar or on the Bookmarks Toolbar if the menu bar is hidden.
The other star button without the drop-marker opens the bookmarks in the sidebar (View > Sidebar > Bookmarks).

You can drag the Bookmarks menu button with the drop-marker in the Customize window from the toolbar palette on a toolbar (e.g. Navigation Toolbar or Tab Bar or to the left side of the Bookmarks Menu Items).
If you do not see the drop-marker then try them both to see which works.

• https://support.mozilla.org/kb/How+to+customize+the+toolbar
• https://support.mozilla.org/kb/Back+and+forward+or+other+toolbar+items+are+missing

• You can toggle the Bookmarks sidebar via View > Sidebar > Bookmarks (Ctrl+B)
• You can toggle the History sidebar via View > Sidebar > History (Ctrl+H)

Did Not solve problem.

Though it did 'succeed' in removing all of my add ons and many settings.

both options for displaying the sidebar: view>sidebar>bookmarks, and the dispay bookmarks button offer the same results on my win8.