>>> My Info: Win7_64, Nightly 49, 32bit, ID 20160526082509 STR_1: 1. Open http://example.org in a new tab. Close the tab 2. Open new tab, type "your ex" in urlbar 3. Press Ctrl+Left (or click before letter "e") 4. Press Ctrl+Delete, then press Delete key (or delete text "your " in any other way I guess) 5. Press Down key, then Up key AR: Url bar is now filled with the entire autocomplete url ER: No autofill. Url bar should have only the originally typed text "ex" This terrible unifiedcomplete thing appeared (bug 1066358) . Then the pref was flipped in bug 1168811 , and the bug became user-visible. Note: Thanks for broken + useless unifiedcomplete "feature" that breaks useful stuff (see my reports) Regression ranges: >  https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=27253887d2cc&tochange=5bd6e09f074e >  https://hg.mozilla.org/integration/fx-team/pushloghtml?fromchange=0a9484a091f5c7891be36a7d6e32e1a6f819cf2e&tochange=6968dac17cdfe0a5055378c1a1929bf6c2f2fb0c
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