This was caused by having tracking protection enabled, since this blocks the script from plug.google.com.
Component: DOM → Tracking Protection
Product: Core → Firefox
Summary: Can't log in to TekSavvy with Google account → Can't log in to TekSavvy with Google account with tracking protection enabled
4 months ago
Status: NEW → RESOLVED
Last Resolved: 4 months ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1273531
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