- Open
about:config
and set:toolkit.legacyUserProfileCustomizations.stylesheets
:true
browser.compactmode.show
:true
extensions.pocket.enabled
:false
- Go to Menu > More Tools > Customize Toolbar...: use compact density, auto-hide downloads button, remove all flexible space and unnecessary items.
- Open
about:support
, copy Profile Folder
cd $PROFILE_FOLDER # copied from the previous step
git clone https://github.com/khuedoan/one-line-firefox chrome
Then restart Firefox.
If your bar doesn't show up in fullscreen when moving the cursor to the top edge of the screen, see #2