Hi nhnnhn,

Go to about:config page by typing about:config in the address bar and clicking "I accept the risk!"

Type layout.css.devPixelsPerPx and you will see that the default value is set to -1.0. You can change its value from 1.1 (remove the - sign) and onward to change the zoom level of the UI. For example, setting the value to 2.0 will double the entire UI size.

Keep in mind, though, that changing this value will change the entire UI size and not just the bookmark font size. This is the best I could find. Hope this helps.

WARNING: Changing preferences through this interface not officially supported Hidden settings edited using the about:config tool are explicitly not supported, which means that Mozilla makes no guarantees they will be supported in the future, or that Mozilla will fix them if they break. Mozilla does not test these preferences, and will not in the future. That includes security and performance testing which these preferences may affect.

[Warning added by moderator.]

Note: if you have a Retina (double-density) display, try starting at 3.0 instead of 1.1, otherwise, everything will be smaller than you expect.

First, thank all of you kindly for your efforts. I've set it at 2.7 which is a good size for me but the drop-down lists of bookmarks are now double spaced so I don't see as many bookmarks per page as I would like. I've enclosed a screenshot to help explain. Does this involve the "css" settings? Thanks again, Newbie H. Novice.

In the current Firefox 92 release you can only reduce the menu spacing via userChrome.css. In the next Firefox 93 release (current Beta/DE) they have added support to reduce the menu spacing via "Density: Compact" on the Customize page.

• [/questions/1349930] New FF update alters bookmark folder
• [/questions/1350206] New Firefox Update Bookmarks Toolbar (Show more bookmarks)

Note that "Compact" is no longer present by default as a Density choice in Customize.

• https://support.mozilla.org/en-US/kb/compact-mode-workaround-firefox