> Sometimes, these redirect URLs take a perceivable amount of time to load, which is very irritating.

Great. On top of my on-going battle with Windows + Firefox + DNS/TLS resolution sometimes stalling for seconds at a time, another few second server-side stall is introduced.

I swear that every day modern computing scenarios get slower and slower instead of snappier and snappier.

Wow - this exact same bug has been happening to me too. I gave up on troubleshooting it after the first few attempts came up with nothing, assumed it was just unique to me.

I searched for this a few months ago and found some mentions of this bug, but yes it affects me too. Can stall up to 20 seconds+ sometimes. Chrome is fine.

I had no idea others hit this, I just assumed it was some wonky setup I have locally. I hope we both figure it out one day haha (or Firefox does)

Exactly this + websites transforming into SPAs, loading lots of JS chunks, displaying spinners and placeholders, 2FAs, login requests, captchas everywhere. Web browsing is now a very frustrating and time-wasting experience!

> On top of my on-going battle with Windows + Firefox + DNS/TLS resolution sometimes stalling for seconds at a time,

Have you tried disabling HTTP/2?