The font for the message-bar component was set up using the fonts from the photon style guide, but they should instead match the font on the rest of the about:addons page.

https://hg.mozilla.org/mozilla-central/rev/ec30e63fed04

Do we want to uplift this to Beta69 or can it ride the trains? Please nominate the patch for approval if you want to uplift.

This issue is Verified as Fixed on Firefox 70.0a1 (20190716001037) on Windows 64- Bit and - MAC os High Sierra 10.13.6 .

Verified against the Firefox 69.0b5 (20190715173502), that the changes to the message bar discopane-notice content, message- bar container, content, body, icon and the spacer element, etc. have been implemented successfully.
An example of the change can be seen on the attached screenshot.

Comment on attachment 9073926 [details]
Bug 1561407 - Match message-bar font with other page styles r?rpl!

Beta/Release Uplift Approval Request

• User impact if declined: Message bars in about:addons will have a small font and not very much padding.
• Is this code covered by automated tests?: No
• Has the fix been verified in Nightly?: Yes
• Needs manual test from QE?: No
• If yes, steps to reproduce:
• List of other uplifts needed: None
• Risk to taking this patch: Low
• Why is the change risky/not risky? (and alternatives if risky): Almost all CSS, one presentation only DOM element added.
• String changes made/needed:

Comment on attachment 9073926 [details]
Bug 1561407 - Match message-bar font with other page styles r?rpl!

Improved font rendering for about:addons. Approved for 69.0b6.

https://hg.mozilla.org/releases/mozilla-beta/rev/943311038575