I do know what he's talking about, as I've had the same exact problem.
When I did research about it (about a year ago) it seemed the devs were considering retina macbooks with a non-default resolution as origin of the bug for some reason - I'm referring to the display setting that appears as "more space" in the regular OSX settings menu, not some arcane hidden configuration.
I regularly check back because I love the idea of using their open source, somewhat privacy-focused alternative to chrome, but it's been years and still not a fix in sight.
Me too, and as it happens, I'm running on retina with "more space" enabled. Firefox is unusably slow, to the point where I'm probably abandoning it after a few weeks of really trying to get into it. Which is a shame, because I love the idea of multi-account containers and other privacy features.
When I did research about it (about a year ago) it seemed the devs were considering retina macbooks with a non-default resolution as origin of the bug for some reason - I'm referring to the display setting that appears as "more space" in the regular OSX settings menu, not some arcane hidden configuration.
I regularly check back because I love the idea of using their open source, somewhat privacy-focused alternative to chrome, but it's been years and still not a fix in sight.