Features Gates have two bits temporary infrastructure that we can remove once something is using them. 1. The demo feature in Feature.toml 2. The allowance that FeatureGate.jsm is unreferenced in [browser_all_files_referenced.js](https://searchfox.org/mozilla-central/rev/01b4b3830ea3cae2e9e431019afa6391b471c6da/browser/base/content/test/static/browser_all_files_referenced.js#180-183)
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Features Gates have two bits temporary infrastructure that we can remove once something is using them. 1. The [demo feature](https://searchfox.org/mozilla-central/rev/01b4b3830ea3cae2e9e431019afa6391b471c6da/toolkit/components/featuregates/Features.toml#1-9) in Features.toml 2. The allowance that `FeatureGate.jsm` is unreferenced in [`browser_all_files_referenced.js`](https://searchfox.org/mozilla-central/rev/01b4b3830ea3cae2e9e431019afa6391b471c6da/browser/base/content/test/static/browser_all_files_referenced.js#180-183)