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Firefox Developer (aarch64) won't switch site theme

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Site design switch to dark mode is broken for me in Firefox Developer Ed. 92.0b3 (aarch64 on M1 machine) at multiple places like manning.com and their Live books or at spring.io. This not so on my intel Mac where this works fine.

I switch to the site's own dark mode. Unlike in my other browsers, the site theme doesn't change. This means Firefox Developer 92.0b3 cannot render one of the designs of the site. I've also tried with all extensions off and this doesn't change anything.

I think this worked when the install was fresh, but clearly something broke. It could be an aarch64 bug, but unsure at the moment.

I'll try with another profile, but it would be nice to find the actual cause too.

Any ideas?

Site design switch to dark mode is broken '''for me''' in Firefox Developer Ed. 92.0b3 (aarch64 on M1 machine) at multiple places like manning.com and their Live books or at spring.io. This not so on my intel Mac where this works fine. I switch to the site's own dark mode. Unlike in my other browsers, the site theme doesn't change. This means Firefox Developer 92.0b3 cannot render one of the designs of the site. I've also tried with all extensions off and this doesn't change anything. I think this worked when the install was fresh, but clearly something broke. It could be an aarch64 bug, but unsure at the moment. I'll try with another profile, but it would be nice to find the actual cause too. Any ideas?

All Replies (3)

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So I made a Firefox Refresh. Did not help.

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OK, so now I've tried with a new profile and this didn't work out. Seems to me this might be a bug then. Anyone can verify this?

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So I tried Troubleshoot mode too and this also solves nothing.

I did notice that the switch seems to execute, but the background and text color doesn't change, only certain images. So this would seem to be a visual bug as the trigger is carried out.