where is now (or how can I restore) the "close" x on right side of each tab?
Since version 49.0.1 update, I lost the "X" on right side of each tab used to close them.
how is it possible to restore this useful feature?
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I think this is what you need;
Type about:config<enter> in the address bar. If a warning screen comes up, press the Be Careful button. At the top of the screen is a search bar. Type browser.tabs.closeButtons and set its value to 1.