Breaks a lot of websites for me. instagram, reddit, marktplaats.nl all have problems where if I used the pinch zoom and zoom back out the page is white and have to refresh to get it back. I did reset all the "browser.gesture.pinch" settings
I don't want to discourage the dev of this addon by leaving a bad review but it's just not working.

edit in response of answer:
thank you for that tip. this works a lot better for me.