URL: https://www.stickermule.com/ca/signup

Browser / Version: Firefox 63.0
Operating System: Mac OS X 10.13
Tested Another Browser: Unknown

Problem type: Site is not usable
Description: You can't login with Google if tracking protection is always enabled
Steps to Reproduce:

• Enable tracking protection as 'always'
• Click on "login in with Google" (it's the same with "sign up with Google"

Actual results:

• Nothing happens

Expected results:

• A pop up shows up allowing to pick a Google account to sign in with
  

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