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Support Extension on Firefox
Popup "Setup Trade Verification" says this:
At the moment, you need to use a Chromium browser (ie. Chrome, Opera GX) in order to use the CSFloat extension. In the future, Firefox will support it -- sorry!
Version 4.3.1 for Firefox is already on GitHub Releases, meaning it technically supports Firefox. Why not just submit new version to Mozilla and make it available in Firefox?