Hi delphi_coder, I don't expect any major UI changes in Firefox 90.

The disconnected button/bubble style tab isn't to everyone's taste. I can give you a quick short-term roll-back workaround, but a more durable solution will require more work.

Temporary Fix

For testing purposes, there is a preference to switch the tab bar and address bar between new style and old style. This is not expected to continue in Firefox 90, but maybe you want to use it for now.

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.

(2) In the search box in the page, type or paste browser.proton.enabled and pause while the list is filtered

(3) Double-click the preference to switch between true (new style) and false (old style)

Longer Term Community Workaround

This involves setting up a userChrome.css file. I have a rules builder that will get more features throughout the month. By the time the above preference is removed, it should be mature. If you want to take a sneak peek now:

• https://www.userchrome.org/firefox-89-styling-proton-ui.html#tabstyler
• https://www.userchrome.org/how-create-userchrome-css.html

Great Hint!!! Turned the life beautiful again.

browser.proton.enabled did the job well. Going through userchrome file changed the button style look but did nothing with the unnecessary height of Tabs.

Many thanks for your help