BF4 True Player Count v0.0.0.3
June 2020 Update: Add-on updated for Firefox changes.
This add-on allows Battlelog users to see the actual player counts on Battlefield 4 servers.
After installing the add-on, login to Battlelog, view the server list, click a server, and you'll see the true player count listed on the right side of the screen. The extension will activate automatically when you login to Battlelog.
Currently, this is only compatible with Battlefield 4.