The only indication of the current page is a slightly darker grey outline on a light grey background. I find this hard to see. I'm attaching a screenshot comparing Firefox (left) with Chrome (right). Chrome uses a light blue outline around the current page on a dark grey background which I find much easier to see. It also dims all the other pages (not sure if I like that though).

Maybe we can switch to a blue outline? (blue because it indicates "selected").

(I'm using Nightly on Linux)

Morgan, is this a problem for accessibility?

(In reply to Marco Castelluccio [:marco] from comment #1)

Morgan, is this a problem for accessibility?

Yep! This is an issue for low-vision folks especially.
If it's possible to use the system accent color here (instead of a static firefox-palette color) that'd be great. I think -moz-accent-color should work for that.
In High Contrast Mode on Windows, we should be using the SelectedItem color

It'd be great if you can help set the severity for this one, I would say s3 or s4 because it's a relatively hidden piece of UI, but I'm not sure how bad it is for low-vision folks.

(In reply to Marco Castelluccio [:marco] from comment #3)

It'd be great if you can help set the severity for this one, I would say s3 or s4 because it's a relatively hidden piece of UI, but I'm not sure how bad it is for low-vision folks.

Sorry, forgot to needinfo you for the above!

All good :)

This should be fixed now, Morgan could you verify?

Hmm, I'm not getting a blue accent colour -- this looks largely the same to me. I'm not sure it's fixed.

This is testing with:

Built from https://hg.mozilla.org/mozilla-central/rev/169e7173a60fb69db064292175b3d66a1dbdae65

The link was wrong, the PR hasn't landed yet: https://github.com/mozilla/pdf.js/pull/16132.