1947150 - Following “Science” and “Parenting” topics other two sections appear into “Followed Topics” list even if they haven’t been actually followed

Status: NEW

(Firefox :: New Tab Page, defect)

Description

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Attachment: FollowBlockBug

[Notes]:

• This issue is also reproducible following “Parenting” when "Life Hacks” topic is followed, too.
• This issue is reproducible also for blocking action for the same two sections: “Science” and “Parenting”.
• This issue is not reproducible for the other topics.

[Affected versions]:

• Firefox Beta 136.0b3 - Build ID: 20250207091649

[Affected Platforms]:

• Windows 10 x64
• macOS Sequoia 15.0.1
• Ubuntu 24.04 x64

[Prerequisites]:

• Have the Firefox Beta 136.0.3 build en* locale installed.
• Have the following prefs set to "true" on the "about:config" page:
  • browser.newtabpage.activity-stream.discoverystream.sections.personalization.enabled
  • browser.newtabpage.activity-stream.discoverystream.sections.enabled
  • browser.newtabpage.activity-stream.discoverystream.sections.customizeMenuPanel.enabled
  • browser.newtabpage.activity-stream.discoverystream.sections.cards.enabled
• Have the "browser.search.region" pref set to US.

[Steps to reproduce]:

1. Open the browser from the prerequisites.
2. Open a new tab.
3. Click on the “Follow” button from the “Science” section.
4. Click on the gear icon from the right bottom of the page.
5. Click on the "Followed and blocked topics" button under the "Sponsored stories" checkbox.
6. Notice the "Followed Topics" section.

[Expected result]:

• Following the “Science” topic no other section appears in the “Followed Topics” list.

[Actual result]:

• Following the “Science” section, “Education” topic appears also in the “Followed Topics” list even if it hasn’t been actually followed.

[Additional Notes]:

• A video of this issue can be find here.
• This issue is also reproducible for the rest of the locales where the topics are available.