Haven't posted in a long while, but I've continued to follow (and use) Arctic Fox, quite a bit. To the point where it has been my primary browser for over a year. However...I feel compelled to add a comment or two at this later stage of heavy usage.
First, I find the browser (even up to 27.9.18, as of this note) continues to have problems with excessive CPU usage. It occurs on even seemingly the most innocuous sites. For example just looking up a recipe yesterday...the browser hit 100% CPU - *2 dual cores at full capacity* - and would not calm down, not even long after having closed the tab, then the window, waiting an hour with the fan running wild, putting the machine to sleep then waking again, etc.. Finally I had to shut AF down, and sure enough, with restart with the exact same tabs as before, CPU usage was running quiet and fine. This is not open for doubt anymore as far as I'm concerned, there is clearly a problem somewhere with this out-of-control CPU thing. Memory leak, thread not stopping properly?...I don't know. It happens relatively often, and like I say with the most "innocent" sites, quite unpredictable but frequent. What bothers me even more is that the problem continues after the tab/window is closed...that raises other questions with what exactly AF continues to do (or allow being done) from sites even after the user has closed off that tab/window?! Anyway as a result of this, as of yesterday I have relegated it back to secondary browser, to be used only when necessary, when running into a "stubborn" site that isn't playing well with my other browsers. This CPU thing has been an issue from the beginning I think.
Second comment is not as serious but still worth mentioning. I find the printing function in AF to be horrible...truly the worst of any browser I have used in the last few years. Constant, constant rendering problems, missing sections/pages. Plus no in-browser preview, and unstable (once or twice crashed the browser as well). I don't know enough about this to know what to suggest but I have to imagine there are certainly ways to improve this...fixes, alternate APIs?... But honestly even before yesterday I had all but given up on printing from AF.
Third, the browser *needs a confirm-before-shutting down option*. This is a long-standing, very baffling lack in AF. It's hard to convey how aggravating it can be to accidentally shut down the browser with no warning whatsoever, and then have to re-load all the open tabs and windows, lose status in some, etc.. If it is already in the options...where?!
Those comments made, I will just add that AF actually remains my "favorite" in terms of usage. It's just that these issues (mainly the first one) have become a bit too much. I'd be overjoyed to make it my primary browser again if these could be fixed/overcome...