Bugzilla

To test:

1. Have the multi process debugger open.
2. Create a brand new profile
3. Set `browser.newtabpage.activity-stream.asrouter.devtoolsEnabled` to true
4. Open about:newtab#devtools-ds
5. Ensure "show_spocs" is checked
6. Scroll down a bit and click "Enable V2 Personalization"
7. Scroll up and click "Trigger Idle Daily"
8. You should now have all the attachments from remote settings downloaded.
9. Scroll up and click "Expire Cache"
10. Scroll up and click "Trigger System Tick"
11. Check the multi process debugger for sources, and look for PersonalityProviderWorker.js.
12. Repeat steps 9 and 10.

Expected: Should see only 1 instance of PersonalityProviderWorker.js.

Actual: You can see a new version of PersonalityProviderWorker.js each time you do step 12.

To test:

1. Create a brand new profile
2. If in beta set devtools.browsertoolbox.fission to true, in nightly it should already be true. If it's true in beta, you can just leave it true.
3. Have the multi process debugger open.
4. Set `browser.newtabpage.activity-stream.asrouter.devtoolsEnabled` to true
5. Open about:newtab#devtools-ds
6. Ensure "show_spocs" is checked
7. Scroll down a bit and click "Enable V2 Personalization"
8. Scroll up and click "Trigger Idle Daily"
9. You should now have all the attachments from remote settings downloaded.
10. Scroll up and click "Expire Cache"
11. Scroll up and click "Trigger System Tick"
12. Check the multi process debugger for sources, and look for PersonalityProviderWorker.js.
13. Repeat steps 11 and 12.

Expected: Should see only 1 instance of PersonalityProviderWorker.js.

Actual: You can see a new version of PersonalityProviderWorker.js each time you do step 12.