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Firefox/Cross-Platform Support (Via WebExtensions)
Please consider supporting Firefox in addition to Chrome. Firefox has near-parity with Chrome's extension API. (This might also let you support Edge at the same time.)
Customer support service by UserEcho
Requested here
Firefox Quantum is a great browser. It would be wonderful to be able to use Tabs Outliner with it.
Tabs Outliner is by far the single most important extension I use, and as such, I am bound to Chrome until Tabs Outliner is able to support other browsers (Firefox in particular) - the new compatibility built into Firefox should make this a reasonably straight-forward port, and I'm certain your userbase would increase substantially as a result...
Yes lack of tab outliner is the only reason i keep using chrome despite firefox being a better browser. Please consider making a port.