1065495 - Add telemetry probe for __proto__ usage

Status: RESOLVED DUPLICATE of bug 1409187

(Core :: JavaScript Engine, defect)

Description

[Till Schneidereit [:till]]

We warn about absolutely every usage of __proto__. I'm not convinced that that is a good idea, given that it's probably used pretty much everywhere, so there's no chance of it ever being removed.

Plus, no other browser warns about it, and I think that there's a danger of people concluding that this is just an issue in Firefox.

To at least turn the first paragraph's "probably" into a "definitely" or "not really", we should add a telemetry probe. Since bug 1054630, doing so would be straight-forward. We could even just extend the existing probe from that bug, I guess.

Comment 1

[Chris Peterson [:cpeterson]]

What would we want to measure? Number of hits? Would a huge number of hits suggest that we should remove this warning because it is a losing battle?

"Use of getPreventDefault() is deprecated.  Use defaultPrevented instead." is another warning that appears everywhere because jquery uses getPreventDefault(). Maybe we should just upstream a fix to jquery.

Comment 2

[André Bargull [:anba]]

We had a __proto__ telemetry probe for some years, but we removed it quite recently (bug 1409187).