This is not skipping a train, it has been available behind a pref, enabled by default in Nightly since 65, and was planned and announced to be enabled for release in 68 months ago, see: https://blog.mozilla.org/addons/2019/03/26/extensions-in-firefox-67/#userscripts There were no bugs reported or changes to the code since it landed in 65, it just looks like it slipped people's mind in the aftermath of addongeddon.
Bug 1514809 Comment 14 Edit History
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This is not skipping a train, it has been available behind a pref, enabled by default in Nightly since 65, and was planned and announced to be enabled for release in 68 months ago, see: https://blog.mozilla.org/addons/2019/03/26/extensions-in-firefox-67/#userscripts There were no bugs reported or changes to the code since it landed in 66, it just looks like it slipped people's mind in the aftermath of addongeddon.
This is not skipping a train, it has been available behind a pref, enabled by default in Nightly since 66, and was planned and announced to be enabled for release in 68 months ago, see: https://blog.mozilla.org/addons/2019/03/26/extensions-in-firefox-67/#userscripts There were no bugs reported or changes to the code since it landed in 66, it just looks like it slipped people's mind in the aftermath of addongeddon.