These are two that I noticed that are used only in browser.xhtml and have ids that were migrate to fluent in Bug 1501886. I'm sure there are more than just these two that fall into this category, but these two seem like easy candidates to start with. https://searchfox.org/mozilla-central/search?q=goOfflineCmd.label&path= https://searchfox.org/mozilla-central/search?q=charsetMenu2.label&path=
Bug 1579470 Comment 0 Edit History
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This is one that I noticed that are used only in browser.xhtml and have an id that was already migrated to fluent in Bug 1501886. I'm sure there are more than just these two that fall into this category, but this seems like easy candidates to start with. https://searchfox.org/mozilla-central/search?q=goOfflineCmd.label&path=