How to change firefox default tab size and fix wonky tab behavior

Under your profile folder create a chrome/ folder

cd /home/`whoami`/.mozilla/firefox/*default*
mkdir chrome
cd chrome

Create userChrome.css file

touch userChrome.css

Update userChrome.css with the following lines:

@namespace url(;
.tabbrowser-tab:not([pinned]) {
max-width: 80px !important;
.tabbrowser-tab:not([pinned]):not([fadein]) {
max-width: 0.1px !important;


Restart firefox and enjoy



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