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The UI is much better and more intuitive than that of TemperMonkey.

I really like the distinction between CSS and JS modifications and that I don’t need to use “proprietary” GreaseMonkey functions like GM_addStyle (` /* the CSS goes here */ `).

FireMonkey also doesn’t exhibit the bug that TemperMonkey does — when I navigated the same portal over many pages, it seemed TM kept adding the same CSS script over and over, which, over time, slowed Firefox noticeably (after a while TM reported aplying about 70 scripts instead of 2!).

Perfect better than the alternatives.

It is indeed super lightweight. A nice advantage to being on Firefox, as it's not available elsewhere.

Since the only userscript managers that worked in Firefox Android (beta & nightly through custom collection) are this and tampermonkey, I choose this becase it's open source and more lightweight. Good job