Bugzilla

**Note**
* When a search engine is been set as default, and then it gets blocked by the Remore Search Engine Blocklisting feature, an incorrect message remains displayed in about:preferences#search that says that the Ecosia is still your default browser.

**Affected versions**
* Nightly v70.0a1 from 2019-08-29
* Beta v69.0 RC
* Release v68.0.2

**Affected platforms**
* all

**Steps to reproduce**
1. Install Ecosia search engine extension:
https://addons.mozilla.org/en-US/firefox/addon/ecosia-the-green-search/?src=search
2. Set it as the default search engine via the door hanger after install.
3. Add "ecosia.org" as a string to block on the "submission-urls" blocklist identifier;
4. Install the "Remote-settings-devtools" extension;
5. Open extension menu, switch to staging, clear all data and poll server.
Now the Ecosia search engine should be blocked.
6. Observe the Search section of about:preferences.

**Expected result**
* No confusing messages should be displayed.

**Actual result**
* Incorrect message is displayed: "An extension, Ecosia - The search engine that plants trees, has set your default search engine."

**Additional notes**
* The same message remains incorrectly displayed even after browser restart.

**Note**
* When a search engine is been set as default, and then it gets blocked by the Remore Search Engine Blocklisting feature, an incorrect message remains displayed in about:preferences#search that says that the manually installed search engine is still your default one.

**Affected versions**
* Nightly v70.0a1 from 2019-08-29
* Beta v69.0 RC
* Release v68.0.2

**Affected platforms**
* all

**Steps to reproduce**
1. Install Ecosia search engine extension:
https://addons.mozilla.org/en-US/firefox/addon/ecosia-the-green-search/?src=search
2. Set it as the default search engine via the door hanger after install.
3. Add "ecosia.org" as a string to block on the "submission-urls" blocklist identifier;
4. Install the "Remote-settings-devtools" extension;
5. Open extension menu, switch to staging, clear all data and poll server.
Now the Ecosia search engine should be blocked.
6. Observe the Search section of about:preferences.

**Expected result**
* No confusing messages should be displayed.

**Actual result**
* Incorrect message is displayed: "An extension, Ecosia - The search engine that plants trees, has set your default search engine."

**Additional notes**
* The same message remains incorrectly displayed even after browser restart.