gitlab sign-in infinite redirect for "checking your browser"

Using postmarketOS' default firefox setup I cannot log into gitlab. GitLab's "checking your browser" page reloads in a loop and does not redirect properly to the sign-in page. Removing the mobile-config-firefox package and relaunching firefox enables gitlab login.

I can work on testing this by creating a new desktop firefox profile, and applying the config changes from mobile-config-firefox one by one until it breaks sign-in.