GitLab refuses to login through Firefox 61.0.1 (64-bit) on Linux

GitLab refuses to sign me in from Firefox. However, it has no problem signing in from Chromium browser on Manjaro OS (Linux)

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The problem can be reproduced on Firefox by simply closing the browser without signing out. The next time when you come back to sign in, the error 422 shows up.

Edited by Prajwal Dhatwalia