Firefox doesn't have a separate zoom setting for toolbars the way it does for pages. However, there is a global zoom factor you can change, and then you can dial down the enlargement of web pages. If you want to try it, here's how: (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button accepting the risk. ''More info on about:config:'' [[Configuration Editor for Firefox]]. ''The moderators would like us to remind you that changes made through this back door aren't fully supported and aren't guaranteed to continue working in the future.'' (2) In the search box in the page, type or paste '''layout.css.devPixelsPerPx''' and pause while the list is filtered (3) Double-click the preference to display an editing field, and change the value to '''2''' (without the minus sign, without the decimal) then press Enter or click the blue check mark button to save the change. What you should expect: on a regular display, the font size should double. On a Retina display, no change. Notes: * The default value of -1.0 refers to your system's default enlargement percentage. * A value of 2 represents 200% of your system's default enlargement percentage. It's generally safe to try 2. If you decide to reduce it to 1.5 for 150%, be careful not to type 15 or everything will be unusably large. * This parameter affects page size, too, but you can dial that back using the default zoom on the Settings page, so you should focus on the toolbar area initially.

Well explained thank you