Using javascript it'd be pretty easy to dynamically hide/show numbers depending on whether or not the text is a member of a certain javascript class. In this case, the class of interest is "mb-0.5 mr-0.5 text-2xl" (which doesn't show up anywhere else on the main page).

More generally, the extension could allow users to mark numbers as "I want to see numbers that show up in places like this" or "I don't want to see numbers that show up in places like this" and then create a rule to show/hide all numbers in that class. If you create a central database of these votes, you can then extend this across users, so that when someone comes across a new website numbers that they want to see are shown automatically.

Of course, sometimes classes aren't enough, but in the case of Manifold it seems like it'd be sufficient (users could vote on whether or not to see text with the class "text-base text-red-500" and green (for recent shifts in market probability).

One downside to this approach is that it would break if the page updates its javascript classes, but if it's crowdsourced it would probably get fixed pretty quickly and only impact a minority of users.

I just spent a couple of hours trying to make a firefox version but I have given up. It's a real pain because firefox still only supports the manifest v2 api. I realized I basically have to rewrite it which would take another few hours and I don't care that much.