Incorrent offset after jumping to footnote in Firefox

[max-ci]

Description

Incorrent offset after jumping to footnote in Firefox (it doesn't take into account header height like in Chrome)

Expected behavior

Correct offset

Actual behavior

Incorrect offset in Firefox

Steps to reproduce the bug

1. Open Firefox
2. Go to https://squidfunk.github.io/mkdocs-material/extensions/footnotes/
3. Click on backref

Package versions

• MkDocs: 2.0.4
• Material: 0.17.1

Project configuration

Irrelevant

System information

• OS: OSX/Windows
• Browser: Firefox 56.0.2 (OSX), Firefox 52.0.1 (Windows)

Works good on Chrome/Safari/Opera

[squidfunk]

Fixed in #609 - again. I also refactored the code a little. This is something that comes up every now and then and is attributed to the fact that the behavior of Chrome is totally different to that of Firefox. Oh I love browsers 💩

[max-ci]

Yeah, love them too, especially differences between these two browsers 💔

[squidfunk]

Released as part of 2.2.0.