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websites appear basic with no colour and elements have black outlines.

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Mac updated to version 10.15.7 and now websites appear basic with no colour and elements have black outlines. I have attached screenshot with Chrome on right hand side and appearing normal and on the left is Firefox which is super basic. Does anybody recognise this problem as i am struggling to find any solutions.

Mac updated to version 10.15.7 and now websites appear basic with no colour and elements have black outlines. I have attached screenshot with Chrome on right hand side and appearing normal and on the left is Firefox which is super basic. Does anybody recognise this problem as i am struggling to find any solutions.
Attached screenshots

Chosen solution

Hi Mackdaddy_1971, Firefox 91 now automatically enables High Contrast Mode when "Increase Contrast" is checked on MacOS. (release notes).

Is it possible you have that setting?

If so, please try one or both of these two options:

(1) Turn off the system-level setting. This appears to be the most effective workaround.

(2) Disable High Contrast mode in Firefox. See: Disable high contrast mode in Firefox.

For both changes, you might need to Quit Firefox and start it up again to see the normal display.

Any difference?

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Chosen Solution

Hi Mackdaddy_1971, Firefox 91 now automatically enables High Contrast Mode when "Increase Contrast" is checked on MacOS. (release notes).

Is it possible you have that setting?

If so, please try one or both of these two options:

(1) Turn off the system-level setting. This appears to be the most effective workaround.

(2) Disable High Contrast mode in Firefox. See: Disable high contrast mode in Firefox.

For both changes, you might need to Quit Firefox and start it up again to see the normal display.

Any difference?

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Thank you so much Jscher! that has fixed the problem straight away. I think one of the only options I hadn't got to yet. Saved me so much time!