chore: temporarily disable FF tests on CI (#6864)
chore: temporarily disable FF tests on CI (#6864)

* chore: temporarily disable FF tests on CI

The tests are regularly flaking (see #6861 for some investigation). In
the mean time it's blocking us landing and releasing, so we'll
temporarily skip FF tests for now.

Co-authored-by: Mathias Bynens <17a2cbc4e33156874a9862b0f530521117e66a3d@qiwi.be>
puppeteer/puppeteer,puppeteer/puppeteer,puppeteer/puppeteer,puppeteer/puppeteer