It notes that it won't work after Firefox 56 on the page. I've learned just now from twitter that they're disabling their XUL stuff with that release, which will probably break my side tabs as well, and make me very sad.
There will be also sidebar tabs extensions in the no-xul-world. Tab Center Redux is already a WebExtensions (compatible with future releases). It still misses the part to hide the original tab strip but there will be an API in the future and in the meantime you can hide it via userChrome.css.
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It notes that it won't work after Firefox 56 on the page. I've learned just now from twitter that they're disabling their XUL stuff with that release, which will probably break my side tabs as well, and make me very sad.
There will be also sidebar tabs extensions in the no-xul-world. Tab Center Redux is already a WebExtensions (compatible with future releases). It still misses the part to hide the original tab strip but there will be an API in the future and in the meantime you can hide it via userChrome.css.