1897231 - Add a preference and expose it on about:support for recording when a search engine was blocked

Status: NEW

(Firefox :: Search, task, P3)

Description

[Mark Banner (:standard8)]

We occasionally get reports of users having issues with loosing their default search engines. To aid with diagnosing this, we would like to record in preferences when we notice a search engine being blocked.

We should:

• Record a preference, e.g. browser.search.lastEngineBlockedTime which is a date time value (converted to seconds).
• Record a preference, e.g. browser.search.lastEngineBlockedValue which records the engine that was blocked.
• The time preference should be exposed to the list of "Important Modified Preferences" on about:support.

The value preference should not be exposed (as that might reveal user data), but it can be something we request from the user if they don't mind sharing.