Bug 1839037 Comment 11 Edit History

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### Beta/Release Uplift Approval Request
* **User impact if declined**: Users with many tabs (100+ estimate) will experience slowdown in the Tab Manager
* **Is this code covered by automated tests?**: No
* **Has the fix been verified in Nightly?**: Yes
* **Needs manual test from QE?**: Yes
* **If yes, steps to reproduce**: - Open many tabs
- Open the Tab Manager (Caret in tabstrip next to new tab button)
- Verify hover and scroll responsiveness are within normal expectations
* **List of other uplifts needed**: None
* **Risk to taking this patch**: Low
* **Why is the change risky/not risky? (and alternatives if risky)**: Not risky, removing a single CSS rule
* **String changes made/needed**: n/a
* **Is Android affected?**: No
### Beta/Release Uplift Approval Request
* **User impact if declined**: Users with many tabs (100+ estimate) will experience slowdown in the Tab Manager
* **Is this code covered by automated tests?**: No
* **Has the fix been verified in Nightly?**: Yes
* **Needs manual test from QE?**: Yes
* **If yes, steps to reproduce**:  
  1. Open many tabs
  2. Open the Tab Manager (Caret in tabstrip next to new tab button)
  3. Verify hover and scroll responsiveness are within normal expectations
* **List of other uplifts needed**: None
* **Risk to taking this patch**: Low
* **Why is the change risky/not risky? (and alternatives if risky)**: Not risky, removing a single CSS rule
* **String changes made/needed**: n/a
* **Is Android affected?**: No

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