Steps to Reproduce: 1. Start Nightly 2. Go to about:preferences#containers 3. Conform button text alignment of Preference button and Remove button Actual Results: Button text alignment is in the left side. (* In the attached image, button width is changed for easy to see) Expected Results: Button text alignment is center.

It looks like this only affects Win/Ubuntu. The text within the buttons seems correctly aligned under macOS 10.12.2.

(In reply to Kamil Jozwiak [:kjozwiak] from comment #1) > It looks like this only affects Win/Ubuntu. The text within the buttons > seems correctly aligned under macOS 10.12.2. You are wrong. It affects on macOS 10.12.2.

> You are wrong. It affects on macOS 10.12.2. Hmmm, I can't seem to reproduce it on macOS :/ I've even changed the padding [1] and it seems like the text is correctly being aligned. With Ubuntu/Win, you can tell off that bat that the "Remove" text isn't being correctly aligned but in macOS, it seems like it's correctly being aligned [2]. CC'ing Jonathan as well as he's the one that usually works on container UI bugs. [1] editedPadding.png [2] default.png

(In reply to Kamil Jozwiak [:kjozwiak] from comment #4) > Created attachment 8819918 [details] > default.png I understand, you should edit button width. (not padding) For example, you can see different padding-left/right of the remove button in default.png.

This gets fixed by bug 1315458.

I confirmed this bug was fixed on 53. Thanks!