I've made separate browser bookmarklets to independently enlarge fonts, switch to a serif font, fatten margins, change colors to black-on-white, and invert all

I've made separate browser bookmarklets to independently enlarge fonts, switch to a serif font, fatten margins, change colors to black-on-white, and invert all colors (dark mode)--because most web designers are barbarians. Different sites need a different mix of buttons. Theoretically, "reader mode" would fix most of this, but chrome & firefox neuter it to some degree for obvious reasons. I'd also add that bitmap fonts rendered at the right size can be far more legible than truetype/opentype ones at larger size thanks to the hinting & antialiasing tax. I really like GNU Unifont.