Some add-ons can display the count of opened tabs in each window separately too, or for all browser windows. There are a few add-ons that can count tabs and display the count in a badge on toolbar.
Note that you still need to subtract 1 to get the actual current count, as opening a tab to go the Telemetry counted as one too. The workaround is to quit and restart Firefox, and then immediately check the value of “_concurrent_tab_count”, which the value reset for each session of browser. If you have opened or closed some tabs, the number of currently still opened tabs may be different with maximum number of tabs ever opened which includes tabs that have been closed. It means that the count is the maximum number of tabs you ever opened during the session of Firefox browser. Bring Google Chrome like Download shelf into Firefox. The value of key gives you the count of maximum concurrent opened tabs in current browser session. SYNC ACROSS DEVICES - seamlessly access and open tabs and bookmarks. Then, locate _concurrent_tab_count under “parent process”.
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