Are you just asking about this site or a more general question.

I am luck y enough to have reasonable eyesight & can read the text on this forum. In fact the text looks close to black for me.

Firefox is easily customisable. You can change things yourself if you need to. This may be a useful article and site

• Accessibility features in Firefox - Make Firefox and web content work for all users_zoom-fonts-and-colors
  • accessfirefox.org

It may be interesting to know what actual colours you are seeing currently. I will check mine and post back.

Edited.

Thanks John99 & Happy112, The menu options allowed me to override the poor contrast text so that Black on White is now the permanent default setting. We'll see how this goes.

Regards.

Yes the text in these boxes is a grey it is shown for me as #484848; but the background is white #FFFFFF

Unfortunately I think the layout and colours are relatively easy to see for most people and I suspect switching to using a very high contrast scheme or monochrome black and white is unlikely.

You do not seem to be using any Firefox extensions that would affect your viewing & appear to be using Windows 10 so we should both see something similar, unless you have been changing Windows settings.

edit Crossed with your last post, but I will leave the info here. Thanks for replying, and hope it works out.

I did just change my colours temporarily with one of Firefox's built in tools and changing to black did not make much of a difference. The grey colour used is perceived by me as near to black.

Did you read the article I linked to in the last post? Do any of the suggestions it contains help you?

Hi   !
Maybe just for future reference:
https://addons.mozilla.org/en-US/firefox/addon/blacken/
(the add-on  NoSquint   is no longer maintained)