Backend anchors have extra styling in firefox

[nmiyazaki-chapleau]

Winter CMS Build

1.2

PHP Version

8.1

Database engine

MySQL/MariaDB

Plugins installed

No response

Issue description

Firefox adds a blue outline to anchor elements on :focus (which honestly looks horrible) and interferes with the look & feel of WinterCMS.
Some example of problematic places include sections with tabs - on click, which makes the element focused, it add a small blue outline on the left and right side of the element.
Example in the CMS tabs:

Example in the underlying section:

Steps to replicate

1. Open firefox
2. Go to backend
3. Click on anything that is an anchor

Workaround

Can be fixed using a:focus, a:focus-visible { outline: none; }. However, I do not know if this is intended behavior.

[damsfx]

Same for form primary tabs

[LukeTowers]

So long as the focused element has some form of styling to distinguish it for usability I'd be more than happy to merge any PR suggested. Let me know if you need help submitting one!

[bennothommo]

I remember this being added back in the October days. It's horrific. I would very much like a more elegant solution.