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.

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

I finally gave in and switched to Firefox Quantum as my default browser, and am grateful to Fushko for Font Contrast. Chromium (Chrome minus Google elements) has a similar High Contrast extension, but it affects all page elements, ruining most images. This extension is well-designed, easy to configure, and -- understanding that this can be a complex feature -- I'm glad to see that the developer is very responsive to user feedback.

I trust this developer. He or she was thoughtful and communicated with users. Also, this is simple, robust work. It made text appear black instead of greyed out, like this page requires. Which is stupid. Therefore, I'd bet it's a smartphone stupidity thing.

It seems you have to click the icon on each page opened, which is fine. Firefox 71.0 64 bit.

Great addon for blurry Windows 10, 5 stars absolutely!

Wonderful for old eyes. Dramatic increase in text darkening. Also can adjust font size, boldness, more within Firefox sourced websites. Much needed with current crop of default fine, light print operating systems.
AR
Running Android 10 on Google Pixel

I sometimes browse or read on an e-ink tablet screen, which feels nicer for my eyes especially for long form reading. Unfortunately sometimes the font uses a lighter gray color and so is harder to read even if on a white background. That's where this extension helps. It makes the page text much easier to read by bolding it among other things. Very useful on a screen type where more contrast is welcome. Thanks!

Life saver! Using it to work with web based zendesk. Could not see anything on their pages.

v1.5.3 now very useful, eases reading.
settings export/import would be a nice option.

Thank You So Much Dear "Firefox user 13187237" , For This Brilliant addon , this is , one of the best needed addons in the whole internet.

it helps, tnks

Perfect for cooking websites, expecially for johnny sins one ;)!

Awesome man, works well on pornhub & xxx.com

Great job mate :)!

Fantastic. Thank you for this add-on. It's exactly what I needed.

5 Stars. This add-on is the best option in Firefox Quantum for correcting the flawed design of websites that feature barely visible grey text. An alternate add-on with the same objective exists, but it is quite buggy in post-57 Firefox.

The introduction of the blacklist feature in version 1.3.1 further cements Font Contrast as the best add-on of its kind. Thanks to the developer for the response to my previous review, in which I had requested this feature.

With regard to the comment by Joy, below:

The icon in the address bar can be hidden (right-click it and select appropriately). Thereafter, right-click the Firefox titlebar, select "Customize..." and drag the Font Contrast icon among your other add-ons. If you ever restart your Firefox with add-ons disabled, you'll have to redo the part about hiding the address bar icon, as doing so will restore the icon. Ultimately, though, what you want is easily done.