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How do I turn off the dark mode for G mail using Firefox on a Macbook Pro

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Does your system use a dark theme? Firefox will share that information with websites to allow them to match your system theme. However, you can override that if you prefer. Could you try the method described in the following thread:

https://support.mozilla.org/en-US/questions/1282748#answer-1300030

Does that resolve the issue on your Firefox?