Bug 775825 introduced telemetry for how often particular types of awesomebar entries are selected by the user. However, it seems difficult to draw any conclusions from these figures without knowing how often these types were available to select in the first place. For example, both "remote tab" and "switch to tab" entries have very low counts, but it is very difficult to know whether this actually means a low level of engagement - it may be that the users selected it every time it was offered as an option (implying the number of times it was offered is very low, but the feature has very high engagement), or it may be that it was offered most of the time and selected rarely (meaning the feature apparently offers no value to users). (a quick look at how the current telemetry is captured implies that this probably isn't going to be trivial, but opening this bug anyway)
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