Enlarging Firefox Bookmark Dialog Box

I recently had to stop using Ungoogled Chromium for various reaasons, the main one being that it no longer worked with YouTube, and the fix for that problem broke other web sites. So I reverted back to Firefox, which is fine (mostly). But one annoying problem is that the dialog box for adding a bookmark is very small, showing only about six rows.

I found a solution in this post. But the details are a bit terse and sketchy.

The first step is to create a userChrome.css file in your Firefox Profile. This web page tells how to do it, but because it’s aimed at Windows and Mac users, it’s terribly complicated due to the tedious nature of using a GUI. It’s a lot simpler on the Linux command line.

Find your Firefox profile directory with these commands:

cd ~/.mozilla/firefox
egrep Default= profiles.ini

That will print something like this:

Default=60hdq6qz.default-release-1601810452348
Default=1

The first line is the interesting one.

Visit that directory (substituting your actual path):

cd 60hdq6qz.default-release-1601810452348

Create a chrome directory and move to it:

mkdir chrome
cd chrome

Create a file userChrome.css with the following contents:

#editBookmarkPanelContent {
    min-width: 47em !important;}
#editBMPanel_folderTree {
min-height: 480px !important;
}
/*remove picture from ctrl-d bookmark menu*/
html #editBookmarkPanelInfoArea {
display: none !important;}

Adjust the min-width and min-height values to your taste and screen size.

Finally, in Firefox, visit the about:config page. In the search box, type userprof . You should see a value called toolkit.legacyUserProfileCustomizations.stylesheets. Change this to true. Then restart Firefox.