Extension code: https://github.com/lucia-gomez/aaasemic-web
p5 sketch: https://editor.p5js.org/lucia.dev42/sketches/lnG-ud572
Aaasemic Web is a Google Chrome extension that turns all text on a page into an asemic font, except for the letter A/a.
I generated a pixelated font with p5. I settled on a 3x3 grid of pixels, where each one is randomly on or off. Each glyph is a unique combination of these pixels. I wrote a script that downloads each of these glyphs as a separate, numbered SVG file.
Then I used a website Glyphter to create a font out of these SVG pixel glyphs. This tool is pretty good, you can bulk upload files and download a TTF font file.