Left sidebar open by default with Firefox on Android

Summary

Navigating to almost any project/group/etc page on gitlab.org re-opens the left sidebar, only on Firefox for Android (stable, beta, and nightly). I have only tested with my Nexus 6P (Android Oreo).

Steps to reproduce

  1. Use Firefox for Android
  2. Navigate to a Group or Project page

Example Project

Any.

What is the current bug behavior?

Sidebar is open on every click, creating a poor user experience doing non-sidebar tasks.

What is the expected correct behavior?

Sidebar is closed by default while navigating groups/projects.

Relevant logs and/or screenshots

Screenshot_20171228-233907 Screenshot_20171228-234017

Output of checks

This bug happens on GitLab.com