I got approval last year to remove this provisional UI on mozilla.dev.identity and since then Persona announced its shutdown later this year. This only removes the code in browser/ since the dom/toolkit code is trickier since B2G uses some of it. I'll file a separate bug to remove unused code there.

Review commit: https://reviewboard.mozilla.org/r/32507/diff/#index_header See other reviews: https://reviewboard.mozilla.org/r/32507/

Try push: https://treeherder.mozilla.org/#/jobs?repo=try&revision=ce24b9c48fa1

Comment on attachment 8712328 [details] MozReview Request: Bug 1243089 - Remove provisional Desktop identity UI for website sign-in with BrowserID (SignInToWebsite). r=felipe https://reviewboard.mozilla.org/r/32507/#review29797 yay, code removal! ::: browser/base/content/urlbarBindings.xml (Diff revision 1) > - <xul:label class="text-link custom-link small-margin" anonid="chooseemail" hidden="true"/> digging the history, `small-margin` looks like something from a distant past, but it looks like it's not used by anything else. Should we remove it?

https://reviewboard.mozilla.org/r/32507/#review29797 > digging the history, `small-margin` looks like something from a distant past, but it looks like it's not used by anything else. Should we remove it? No, comm-central uses it: https://mxr.mozilla.org/comm-central/search?string=small-margin