how do I reduce the depth of my navigation bar in firefox 38.0.5 - I want to delete the blank grey line under the address bar
I like to keep the navigation bar as small as possible on my screen so I increase my browsing space, one of the lines has only one button "save to pocket" it's a function I don't use so I've removed it but the empty line remains. How can I remove the empty grey line?
Opaite Mbohovái (1)
Hi, that may be caused by one of your add-ons, so Try Firefox Safe Mode to see if the problem goes away. Firefox Safe Mode is a troubleshooting mode that temporarily turns off hardware acceleration, resets some settings, and disables 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 Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.
- On Mac: Hold the option key while starting Firefox.
- On Linux: Quit Firefox, go to your Terminal and run firefox -safe-mode
(you may need to specify the Firefox installation path e.g. /usr/lib/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, theme, or hardware acceleration. Please follow the steps in 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.
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If it isn't caused by an add-on, it may be an empty bookmarks bar. To turn it off, press Alt to bring up the menu bar > View tab > Toolbars, and untick/uncheck Bookmarks Toolbar.
If your question is resolved by this or another answer, please take a minute to let us know. Thank you.