The team behind the Firefox browser has changed their plans on Compact Density removal from customization options. The browser will continue to include Compact Mode, but it will be hidden by default, and tagged as "not supported" when you enable the option.
For Firefox 89, the Compact density option will be hidden by default in Menu > Customize Firefox.
However, there will be a new
about:config option to revive the missing option. In order to bring it back, you need to set the
browser.compactmode.show value to true. Right after that, if you open the Menu > Customize Firefox tool, you will find the Compact mode available. However, it is tagged as not supported.
Mozilla is not enthusiastic about this mode. According to the company, not that many users use it and find it hard to discover. For this reason, the company decided to remove it from the browser. However, the company eventually changed its mind, and made the Compact option hidden instead. This had happened probably due to negative feedback the company received after announcing the change.
Now, for existing Compact Density users, the option will remain visible. Users who never used the Compact density option won't find it visible, but will be able to activate it.
The Compact UI option allows you to reduce the UI size in favor of web content. Currently, Firefox and Vivaldi are the only browsers that offers customizable UI size. Other popular browsers, such as Chrome or Edge, use fixed UI size that changes depending on the system DPI scale.
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