[Accessability] Allow Users to Enforce Self-Selected Fonts

For people with imperfect or impaired vision (as well as people with perfectly good vision but strong typeface preferences) it would be helpful to allow at least an on/off toggle, and preferably a variable degree, of enforced substitution of locally-selected fonts to override the fonts presented on websites.

For my own example, one of the ways I celebrated my recent birthday was by getting an eyeglasses chain so I can take my spectacles off without having to hold them (or set them down and lose them) and they're still right there so I can put them back on easily. Makes me look like an oldster, but the fact is I can't tell if I'm in the right aisle at the grocery store unless my glasses are ON, but I can't see the products or read the labels unless my glasses are OFF. Likewise, when I'm sitting at my desk, my choices are to be able to see kinda passably well enough without my glasses, or differently kinda passably well enough with my glasses.

So anything that makes the screen easier to read is a real help. Big text (headlines, etc) is readily legible in pretty much any font, but the legibility of smaller text (news articles, the text above the entry boxes on this present request-a-feature page, etc) is much more font-dependent. I would love to be able to make sites use Atkinson Hyperlegible Next, for example; it would make my browsing a lot easier, more pleasant and productive.

There are Chrome and Firefox extensions claiming to enable this, but none I've found actually works at all in Orion.