Some the values [measured](https://telemetry.mozilla.org/new-pipeline/dist.html#!cumulative=0&end_date=2019-08-27&include_spill=0&keys=__none__!__none__!__none__&max_channel_version=beta%252F69&measure=JS_DEPRECATED_ARRAY_GENERICS&min_channel_version=null&processType=*&product=Firefox&sanitize=1&sort_by_value=0&sort_keys=submissions&start_date=2019-07-08&table=0&trim=1&use_submission_date=0) here are still extremely high, especially `slice` and `forEach`. On the other hand I haven't seen any fallout from this change on Nightly. Maybe there a lot of instances where websites already have some fallback/polyfill for other browsers.
Bug 1222547 Comment 11 Edit History
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Some the [measured](https://telemetry.mozilla.org/new-pipeline/dist.html#!cumulative=0&end_date=2019-08-27&include_spill=0&keys=__none__!__none__!__none__&max_channel_version=beta%252F69&measure=JS_DEPRECATED_ARRAY_GENERICS&min_channel_version=null&processType=*&product=Firefox&sanitize=1&sort_by_value=0&sort_keys=submissions&start_date=2019-07-08&table=0&trim=1&use_submission_date=0) values are still extremely high, especially `slice` and `forEach`. On the other hand I haven't seen any fallout from this change on Nightly. Maybe there a lot of instances where websites already have some fallback/polyfill for other browsers.