You can find it in the "Local Settings" section in the settings. If you are on mobile, you have to scroll down from the settings block. Also you may need to clear caches.

Note:

These options are kept on the device and are not synchronized between devices.

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[–] yay@lemmynsfw.com 1 points 1 year ago* (last edited 1 year ago) (1 children)

I can't even login on Firefox Mobile so can't help about this unfortunately. Safari works tho.

[–] dav_Idka_j@lemmynsfw.com 1 points 1 year ago* (last edited 1 year ago)

I just tried it out on a freshly installed firefox mobile on android and it worked, even though I could not login via E-Mail and had to use my username instead.