I just took a look at Firefox 45 and with my STR, I get identical results. So it has been around at least since then.
Bug 1560821 Comment 3 Edit History
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I just took a look at Firefox 25 and with my STR, I get identical results. So it has been around at least since then.
While I was unable to find a build that autofilled my desired URL (https://play.google.com/music/listen), I was able to find that as of Firefox 5, Firefox didn't autosuggest https://play.google.com and that its first suggestion was the expected one: https://play.google.com/music/listen By FIrefox 41, Firefox had begun both autofilling and autosuggesting https://play.google.com (the unexpected case that prompted this bug). The regression range below represents when Firefox began autosuggesting https://play.google.com (in addition to autofilling). 7:53.96 INFO: Narrowed nightly regression window from [2015-05-27, 2015-05-30] (3 days) to [2015-05-29, 2015-05-30] (1 days) (~0 steps left) 7:53.97 INFO: Got as far as we can go bisecting nightlies... 7:53.97 INFO: Last good revision: f986e55c4e0b (2015-05-29) 7:53.97 INFO: First bad revision: 45a4d6336c73 (2015-05-30) 7:53.97 INFO: Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=f986e55c4e0b&tochange=45a4d6336c73
While I was unable to find a build that autofilled my desired URL (https://play.google.com/music/listen), I was able to find that as of Firefox 5, Firefox didn't autosuggest https://play.google.com and that its first suggestion was the expected one: https://play.google.com/music/listen The regression range below represents when Firefox began autofilling https://play.google.com 6:34.79 INFO: Narrowed nightly regression window from [2012-03-12, 2012-03-14] (2 days) to [2012-03-12, 2012-03-13] (1 days) (~0 steps left) 6:34.79 INFO: Got as far as we can go bisecting nightlies... 6:34.79 INFO: Last good revision: 5ec9524de1af (2012-03-12) 6:34.79 INFO: First bad revision: 8d1c74566a0b (2012-03-13) 6:34.79 INFO: Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=5ec9524de1af&tochange=8d1c74566a0b By FIrefox 41, Firefox had begun both autofilling and autosuggesting https://play.google.com (the unexpected case that prompted this bug). The regression range below represents when Firefox began autosuggesting https://play.google.com (in addition to autofilling). 7:53.96 INFO: Narrowed nightly regression window from [2015-05-27, 2015-05-30] (3 days) to [2015-05-29, 2015-05-30] (1 days) (~0 steps left) 7:53.97 INFO: Got as far as we can go bisecting nightlies... 7:53.97 INFO: Last good revision: f986e55c4e0b (2015-05-29) 7:53.97 INFO: First bad revision: 45a4d6336c73 (2015-05-30) 7:53.97 INFO: Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=f986e55c4e0b&tochange=45a4d6336c73
While I was unable to find a build that autofilled my desired URL (https://play.google.com/music/listen), I was able to find that as of Firefox 5, Firefox didn't autosuggest https://play.google.com and that its first suggestion was the expected one: https://play.google.com/music/listen The regression range below represents when Firefox began autofilling https://play.google.com 6:34.79 INFO: Narrowed nightly regression window from [2012-03-12, 2012-03-14] (2 days) to [2012-03-12, 2012-03-13] (1 days) (~0 steps left) 6:34.79 INFO: Got as far as we can go bisecting nightlies... 6:34.79 INFO: Last good revision: 5ec9524de1af (2012-03-12) 6:34.79 INFO: First bad revision: 8d1c74566a0b (2012-03-13) 6:34.79 INFO: Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=5ec9524de1af&tochange=8d1c74566a0b By FIrefox 41, Firefox had begun both autofilling and autosuggesting https://play.google.com (the unexpected case that prompted this bug). The regression range below represents when Firefox began autosuggesting https://play.google.com (in addition to autofilling). 7:53.96 INFO: Narrowed nightly regression window from [2015-05-27, 2015-05-30] (3 days) to [2015-05-29, 2015-05-30] (1 days) (~0 steps left) 7:53.97 INFO: Got as far as we can go bisecting nightlies... 7:53.97 INFO: Last good revision: f986e55c4e0b (2015-05-29) 7:53.97 INFO: First bad revision: 45a4d6336c73 (2015-05-30) 7:53.97 INFO: Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=f986e55c4e0b&tochange=45a4d6336c73 The behavior prior to Firefox 41 is preferable to the behavior today, because autofilling feels different than suggesting - it feels odd that Firefox would suggest a URL I had never been to, and what is worse, I can't remove the "suggestion" by doing a shift+delete on it like I can for other suggestions.