STR: (Nightly 43.0a1 (2015-08-19)) 1. Create bookmark "mailto:%s" with keyword "m" 2. Type "m dolske@mozilla.com" into the location bar. Result: Suggestion says: moz-action:keyword,{"url":"mailto:dolske@mozilla.com","input":"m dolske@mozilla.com"}: dolske@mozilla.com The same error appears when I'm trying to use bookmark "about:config?filter=%s" with keyword "a". Expectations: It should say (as I think) "mailto: dolske@mozilla.com" I guess, every protocol is affected, so even if it's fixed for common protocols, we need to ensure that autocomplete suggestion could be displayed for protocols registered by add-on developers. // And probably more issues appear if you use bookmark "%s:someStaticText" for "dynamic protocol" but even I think that this is very edge case. Yet it may be fixed by bug 1196849

as I said in the other bug, the use case is an unsupported "feature" of keywords. We may evaluate to fix the ui glitch, but it won't block unified complete.