**Steps to replicate the issue** (include links if applicable):
* Visit https://en.wikipedia.org/w/index.php?title=Firefox&action=edit while being logged in into wikipedia account (make sure you visit in dekstop view)
* Write some random characters into the article (do not click "submit")
* Tap on "Log out" in top right
* In the opening window, tap on "STAY"
* Open a new tab and open en.wikipedia.org there
**What happens?**:
User gets logged out
**What should have happened instead?**:
User should stay logged in when selecting "STAY", the "Log out" command should not be submitted if user selects "STAY"
**Software version** (on `Special:Version` page; skip for WMF-hosted wikis like Wikipedia):
**Other information** (browser name/version, screenshots, etc.):
Chrome, Firefox and others. Videos of reproducing: https://bugzilla.mozilla.org/show_bug.cgi?id=1924136#c5