Bug 1675537 Comment 3 Edit History

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### Beta/Release Uplift Approval Request
* **User impact if declined**: We are releasing Urlbar Update 2 in Firefox 83, but we decided to disable this sub-feature.
* **Is this code covered by automated tests?**: Yes
* **Has the fix been verified in Nightly?**: No
* **Needs manual test from QE?**: Yes
* **If yes, steps to reproduce**: Entering Search Mode with an empty string (for example by clicking on a one-off search button, or CTRL+K) should not show search history or browsing history results.
* **List of other uplifts needed**: None
* **Risk to taking this patch**: Low
* **Why is the change risky/not risky? (and alternatives if risky)**: This is just pref-flipping a sub feature of update2, that was one of the possible outcomes we planned.
* **String changes made/needed**:
### Beta/Release Uplift Approval Request
* **User impact if declined**: We are releasing Urlbar Update 2 in Firefox 83, but we decided to disable this sub-feature.
* **Is this code covered by automated tests?**: Yes
* **Has the fix been verified in Nightly?**: No
* **Needs manual test from QE?**: Yes
* **If yes, steps to reproduce**: Entering Search Mode with an empty string (for example by clicking on a one-off search button without a search string, or CTRL+K) should not show search history or browsing history results.
* **List of other uplifts needed**: None
* **Risk to taking this patch**: Low
* **Why is the change risky/not risky? (and alternatives if risky)**: This is just pref-flipping a sub feature of update2, that was one of the possible outcomes we planned.
* **String changes made/needed**:

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