1669497 - [Experiment] The "Fission" doorhanger is wrongly displayed when enrolled in the "fission-disabled" branch

Status: VERIFIED FIXED

(Firefox :: Messaging System, defect)

Description

[Marius Coman [:mcoman], Ecosystem QA]

Attachment: rec of the issue.gif

[Affected versions]:

• Firefox Nightly 83.0a1 - Build ID: 20201006041051

[Affected Platforms]:

• Windows 10 x64
• Windows 7 x64
• macOS 10.15

[Prerequisites]:

• Have a new Firefox profile created.
• Have the user.js for the “fission-disabled” branch downloaded to your PC.

[Steps to reproduce]:

1. Open the browser with the profile from prerequisites.
2. Navigate to the "about:support" page and open the profile folder.
3. Paste the user.js file from prerequisites and restart the browser.
4. Restart the browser for the second time and navigate to any website (e.g. https://www.wikipedia.org/).
5. Observe the behavior.

[Expected result]:

• The page is successfully opened and there is no "Fission" doorhanger displayed.

[Actual result]:

• The "Fission" doorhanger is also displayed.

[Notes]:

• Attached a screenshot of the issue.

Comment 1

[Andrei Oprea [:andreio]]

Can you please confirm from about:home#devtools-targeting the value of isFissionExperimentEnabled when this happens?
Is it showing up as true when enrolled in the "fission-disabled" branch?

Comment 2

[David Teller [:Yoric] - still alive but not very active]

Attachment: Bug 1669497 - Fix isFissionExperimentEnabled;r?nika

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/cf9b40bed8cb
Fix isFissionExperimentEnabled;r=nika

Comment 4

[Marius Coman [:mcoman], Ecosystem QA]

Hi Andrei, I have verified this in the "about:home#devtools-targeting" page, and I can confirm that the status of the isFissionExperimentEnabled expression is true.

Comment 5

[David Teller [:Yoric] - still alive but not very active]

Problem identified. The patch above should fix it.

Comment 6

[Atila Butkovits]

https://hg.mozilla.org/mozilla-central/rev/cf9b40bed8cb

Comment 7

[Marius Coman [:mcoman], Ecosystem QA]

I have verified that this issue is no longer reproducible with the latest Firefox Nightly (83.0a1 Build ID - 20201008094950) installed, on Windows 10 x64 and Mac 10.15. Now I can confirm that the "Fission" doorhanger is no longer displayed when enrolled in the "fission-disabled" branch.