Created attachment 8901489 [details] "Add application" notification bar Attaching screenshot from Nightly 57.0a1 (2017-08-26, Build ID 20170826100418) on macOS.
What's wrong with the current styling / what different styling would you expect?
Inconsistency in button styling, for example. The buttons in the sidebar (History > View), Preferences are all square. The notification buttons are rounded. I would expect them to look something similar to the informational "ISSUES?" tip in . Also, from the screenshot - the text is vertically off-center, not inline with the favicon on the left and the button on the right.  http://design.firefox.com/photon/visual/typography.html
Component: Theme → Themes
OS: Unspecified → Mac OS X
Priority: -- → P3
Product: Firefox → Toolkit
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