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You also have a list of all open tabs available from the dropdown arrow at the far right, but the tab width can be changed in about:config with browser.tabs.tab
by fencepost 7y ago
You also have a list of all open tabs available from the dropdown arrow at the far right, but the tab width can be changed in about:config with browser.tabs.tabMinWidth.
If you're looking for information on this preference, it went away between FF4 and FF57(?) but should be back and working now so you'll see a lot of old information about it being removed.
Edit: FF58, https://bugzilla.mozilla.org/show_bug.cgi?id=1404465 https://bugzilla.mozilla.org/show_bug.cgi?id=1404465