Open Bug 1376766 Opened 6 years ago Updated 2 months ago

[FirstPartyIsolation] Social login on not working with FPI


(Core :: DOM: Security, defect, P3)




Tracking Status
fennec + ---
firefox55 --- affected
firefox56 --- affected


(Reporter: ohorvath, Unassigned)


(Blocks 1 open bug)


(Whiteboard: [domsecurity-backlog1])

Create the perf ""privacy.firstparty.isolate"" and enable it 
Disable the perf ""network.predictor.enabled""
Disable the perf ""network.predictor.enable-prefetch"" 
Disable the perf ""browser.safebrowsing.malware.enabled""
Disable the perf ""browser.safebrowsing.phishing.enabled"" 
Create the perf ""privacy.firstparty.isolate.restrict_opener_access"" and Enable it

Steps to reproduce:
1. Go to and open the login page.
2. Tap one of the social networks to login with.

Expected results:
The social network login page is opened and users can login to with that account.

Actual results:
Social login doesn't work. With fpi off, it works after pressing twice the same "Connect with..." button, but with fpi on it keeps returning to the login screen.
tracking-fennec: --- → ?
QA Contact: oana.horvath
Ethan, would you help check if this is something TPE SecEng team going to take? Thanks.
Flags: needinfo?(ettseng)
Priority: -- → P3
Whiteboard: [domsecurity-backlog1]
Tim, please investigate this time when you have spare time, thanks.
Assignee: nobody → tihuang
Flags: needinfo?(ettseng)
[triage@0719] +, as SecEng team is taking it.
tracking-fennec: ? → +
Assignee: tihuang → nobody
Severity: normal → S3

FPI (Firefox Private Network) is a VPN service offered by Mozilla. It is possible that social login on is not working with FPI due to the VPN blocking certain scripts or cookies required for the social login process to work properly.

Here are some troubleshooting steps you can try:

Disable FPI: Turn off the FPI service and try logging in again to see if the social login works without the VPN. If it does, the issue is likely related to the VPN.

Clear browser cache and cookies: Clearing your browser cache and cookies can help resolve login issues. Go to your browser settings and clear the cache and cookies, then try logging in again.

Try a different browser: If the above steps do not work, try using a different browser without FPI enabled to see if the social login works.

Contact website support: If none of the above steps work, contact the website's support team for assistance. They may be able to provide additional troubleshooting steps or information specific to their website. Source

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