(See screencast in comment 6 which shows Chrome's tab-title throbber continuing to animate, up until the page content shows up here (and even for a little bit afterwards, whereas Firefox's throbber stops animating much sooner. I don't think that difference is worth worrying about too much as a webcompat issue, but I just captured it for the record, since it seems interesting & perhaps worth following up on somewhere; and it might explain this bug, depending on whether or not Firefox's lack-of-a-throbber might've tricked Calin into thinking that the page was doomed to stay blank when in fact it was just getting ready to show its content after a few more network resources finished loading.)
Bug 1921236 Comment 7 Edit History
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(See screencast in comment 6 which shows Chrome's tab-title throbber continuing to animate, up until the main page content shows up, and even for a little bit afterwards; whereas Firefox's throbber stops animating much sooner while the page is still mostly blank. I don't think that difference is worth worrying about too much as a webcompat issue, but I just captured it for the record, since it seems interesting & perhaps worth following up on somewhere; and it might explain this bug, depending on whether or not Firefox's lack-of-a-throbber might've tricked Calin into thinking that the page was doomed to stay blank when in fact it was just getting ready to show its content after a few more network resources finished loading.)