1986015 - [Experiment] Client is enrolled in the "Firefox VPN for Windows 10 Users - Alpha" experiment even if a manual proxy is set

Status: VERIFIED FIXED

(Firefox :: IP Protection, defect)

Description

[Marius Coman [:mcoman], Ecosystem QA, PTO until 20th of October, for any testing requests ping :poiegas]

Attachment: rec of the issue.gif

[Affected versions]:

• Firefox Beta 143.0b5 - Build ID: 20250827090822
• Firefox Nightly 144.0a1 - Build ID: 20250828092344

[Affected Platforms]:

• Windows 10 x64

[Prerequisites]:

• Have a Firefox en-US locale installed.
• Have a Firefox profile older than 7 days.
• Have FxA enabled, but you are not signed in to sync.
• Have no enterprise policies.
• Have the app.update.channel pref set to release in the "about:config" page.
• Have the user.js file saved to your PC.

[Steps to reproduce]:

1. Open the browser using the profile from the prerequisites.
2. Navigate to the "about:preferences" page and search for the "network" term.
3. Click the "Settings" button from the "Network Settings" section and set up a manual proxy configuration.
4. Navigate to the profile folder and delete the "state.json" file from the "datareporting" folder.
5. Paste the user.js file from the prerequisites in the same folder and restart the browser.
6. Navigate to the "about:studies" page and observe the active experiments.

[Expected result]:

• The "Firefox VPN for Windows 10 Users - Alpha" is not displayed in the list.

[Actual result]:

• The "Firefox VPN for Windows 10 Users - Alpha" is displayed in the list and marked as active.

[Notes]:

• It seems that if a manual proxy is set, the value of the network.proxy.type pref is set to 1, and according to the information I've found is set to 2 only if the proxy was set using a Proxy Auto-Config file.
• Attached a screen recording of the issue.

Comment 1

[Fred Chasen [:fchasen]]

Thanks for the note with the correct type, updated in https://github.com/mozilla/experimenter/pull/13395.

Comment 2

[Fred Chasen [:fchasen]]

Targeting has updated.

Comment 3

[Marius Coman [:mcoman], Ecosystem QA, PTO until 20th of October, for any testing requests ping :poiegas]

I have verified that this issue is no longer reproducible using the latest Firefox Beta 143.0b8 (Build ID: 20250903090610) installed on Windows 10 x64. I can confirm that clients are not enrolled in the experiment if a manual proxy is set.

Considering the above, I will close this issue as Resolved - Fixed.

Comment 4

[Marius Coman [:mcoman], Ecosystem QA, PTO until 20th of October, for any testing requests ping :poiegas]

Marking this issue as Verified based on my previous comment.