doesn't work

Only just installed this but it seems very good. Simple and effective.

My only minor criticism so far is that the icon is, ironically, pretty much invisible in most of the FF themes that I have.

Oh, and it doesn't seem to work on Facebook?

I have macular degeneration and I thought I was going to have to give up on Firefox. This extension makes it possible for me to keep using Firefox.

This add-on basically applies a high-contrast theme to site fonts, getting rid of the boring gray text that so many sites are filled with (which I only realized when I started using this). It works perfectly and you can easily turn it off and on for different pages. You can also whitelist or blacklist sites so that sites you visit regularly look good with no fiddling required. There are plenty of settings to mess with though if you want. On default settings it's actually pretty smart about where it applies the contrast fix--it doesn't blacken links or text that's supposed to be colorful, and it has made everything easier to read for me so far. You might think it would look janky but actually, everything looks cooler when the text has some weight and doesn't blend in with the background. It's a subtle "digital" aesthetic. Perfect add-on.

Works well, except for sites which abuse the !important tag in their css. For example
the reviews on www.wilko.com. It's littered with !important tags. I was able to temporarilly make the pale grey text black by deleting one "!important" from a tag in the Firefox console, thus proving the point. Perhaps there's a way to override these evil tags in the addon?

Really helps on HIDPI screen that is somewhat washed-out. Good work!

Breaks Google Calendar on my Asus tablet using Firefox 89.0

The most useful extension I have ever used. Saves constant zooming in and out of web pages to read small faint fonts. Wonderfully customisabe, easy to use and light on resources. Many thanks to very capable dev.

It's challenging reading grey font on a white background, and this is the best solution I've found so far. Looking forward to testing it out thoroughly. Curiously, the only page it hasn't worked on so far is the mozilla add ons page (https://addons.mozilla.org/en-US/firefox/addon/font-contrast-fix). Perhaps I'm doing something wrong?

This addon makes reading much easier, I appreciate it. A small improvement would be welcome: when activated, it does not affect the text of unfolded comments in livejournal.

Option panel doesn't show options ! FF 78.0.1 x64 win10 here and last version of extension

Can Someone explain what is the difference between Increase font (%) and Threshold (px)?