Hi, thanks for the feedback. I will break your issue in parts, and answer them separately.

1) You wrote "swipe to go back is finicky and doesn't always work". Have you tried customizing the extension's settings? Maybe, by increasing the sensibility or the timeout settings you can achieve better functionality. At least I hope so. Keep me posted.

2) Beware that all AddOns are deliberately disabled (by default policy, by Mozilla Firefox iself) just on some pages. This can give the illusion that the extension "sometimes" unpredictably, doesn't work. No extension will work if you are on any page from the domains *.mozilla.net, *.firefox.com, *.mozilla.org! The same applies for special pages like about:preferences, about:config and - most important! - about:home. This last one, Firefox's default homepage "about:home", is likely the reason why some other people like you complains that the swipe forward does not work. Maybe you install the extension, open a new tab, search something, then click a couple of times on random links, finally you try to swipe back (and it works), but once you hit the first page, the home, you are not able to swipe forward because it's about:home.

Please make sure that you aren't on any of these pages and, if the problem is still there, feel free to submit another complain. I'd be interested in knowing if this happens specifically on some websites.

Thanks for the feedback!