But there are users who are still not happy with this solution, especially when they need to hide the tab for a certain amount of time, like the previous Tab Groups feature has now been removed in Firefox.
In response to user requests, Mozilla created tabs.hide () functionality for WebExtension API, currently being tested by the Firefox developer add-on community. Some recent comments show that this feature has been successful and a Mozilla blog post said the feature will officially appear.
From Firefox 62, developers of add-ons can create add-ons to take advantage of this feature, without the user having to switch extensions.webextensions.tabhide.enable to 'true' in about: config section.
If changing the settings above is not too troublesome, you can use this feature with some of the existing utilities on Firefox.
Hide Tabs is probably the easiest to use, hiding all tabs in a drop-down menu on the right side of the browser window.
Hide tabs into another drop-down menu on your browser using Hide Tabs
The second utility is Panorama View, which attempts to mimic Firefox's previous Tab Groups feature, allowing grouping and hiding tabs.
Group and hide tabs with the Panorama View utility
Another browser that is trying to fix the problem of opening too many tabs is Opera. In the latest version of Opera 53, the site's icon is minimized to see what page they are opening, but the problem of displaying too many tabs is not fixed yet.
This is Opera's fix, but there are still many tabs
See more: