Since adding support for other browsers means more time spent on testing, debugging and deploying, we'll let the community handle this one. If you want the extension to work in one of the following browsers test it, make pull requests if necessary and we'll handle the deployment.

Opera

Supports WebExtensions this should be pretty easy.

Edge

Partially support WebExtensions, may need additional developments to work

Safari

Does not support WebExtensions. Needs a full re-implementation.

Yandex

Vivaldi

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See https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Browser_support_for_JavaScript_APIs for details about compatibility.