I’m having a really annoying issue with Mozilla Firefox on Android, but it only happens on YouTube’s mobile site (m.youtube.com). The back and forward buttons don’t work properly there. For example, if I’m on the YouTube homepage and open a video, then from under that video I tap another suggested video — when I press the back button, instead of taking me back to the previous video, it jumps straight to the YouTube homepage. The same thing happens if I search for something, open a video from the results, and then try to go back. It doesn’t return me to the search results — it just takes me to the homepage again. The forward button has the same issue too — it skips everything and goes to the next home page in the history instead of the actual next page I visited. This only noticed it on YouTube’s mobile site. I did not test other websites, but i didn't notice the back/forward navigation having any issue. There might be a issues or maybe they might work fine, i just didn't notice it so far. So yeah, it looks like Firefox’s navigation history doesn’t handle YouTube’s pages correctly on mobile.