firefox

1. Go to about:config, enable config toolkit.legacyUserProfileCustomizations.stylesheets.
2. Go to about:support > Profile Directory > Open Directory. Firefox profile directory will be openned in new window.
3. In your profile directory, create folder chrome if not exist.
4. Go to folder chrome, create file userChrome.css.
5. Copy content from multi-row_tabs.css into userChrome.css.
6. Restart Firefox.

Add-ons: History AutoDelete

Features:

• Auto delete expired history. For example, you don’t want to keep history since 30 days ago.

• Auto delete a specific domain’s history. There are obvious websites we don’t want to keep in our history 🙈.