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

I could be mistaken, but I think the "Form Border" option is only available via the options button in the address bar (popup panel). It's missing when accessing the settings through the addon manager. I think I'm using the latest version of the extension. My machine runs Firefox 56.0.2 64-bit on Windows 7 64-bit platform. The issue could be with my outdated version of Firefox - which I deliberately don't want to upgrade. Aside from that, this extension is absolutely awesome! Love the toggle on/off option.

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.

Good extension, but needs more refinement in performance area. It freezes FF for several seconds, turns pages loading very slow. Blacken is better for now.

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.

Nice little add-on, but a bit limited. Can only target grey text and not less-contrast text of other colors. Does not deal with text that are too small, or link colors. I'd suggest the "Text Legibility" addon instead.

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 :)!

Nice add-on except that the "Skip links", "Skip headers" options are broken as of Firefox 62? When enabled for all sites, it works but all headers and links turn black.