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Thanks.

I did struggle to find a logical explanation for the problem. For the past ~three months I made the lazy assumption that an unusual combination of extensions was among the root causes of the problem. Plus a lazy assumption that my use of Firefox was a rarity (compared to use of Safari) in MacRumors Forums. I learnt try to habitually work around the problem by clicking 'More Options…' but often, I'm focused more on content than on workarounds so I instinctively click 'Post Reply'. The habit of using that button is surprisingly hard to break.

Finding the problem with Firefox in safe mode – with add-ons (including extensions) supposedly disabled – surprised me.

If you start Firefox in safe mode, do you reproduce the problem?