Appled all the changes from the upstream 18.104.22.168 update. Fixed tab opening in background and tab choosing on a tab close.
Update to 2.53.7
Enable support for module scripts. (To turn it off, toggle "dom.moduleScripts.enabled" in about:config).
For sending mail, now "Thunderbird" is advertised in User-Agent header instead of "Firefox" (if any).
Some performance fixes, including from upcoming releases.
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