+++ This bug was initially created as a clone of Bug #1080787 +++ There seem to be focus issues at play here, where the panel opens correctly but because of whatever kind of race (AFAICT, with the page in the tab loading), the search input box is never focused...
The problem is likely related to _adjustFocusAfterTabSwitch. With e10s, when a remote tab is switched to, we wait until it fires the MozAfterRemotePaint event before actually flipping the deck to show the tab content. After we flip the deck, we (maybe) adjust focus for the tab we're switching to. This is likely what's stealing the focus from your input box. I wonder if we should have our test framework wait until focus handling has finished before executing - maybe by firing an event when _adjustFocusAfterTabSwitch is completed, or somehow else detecting that focus has changed and settled.
tracking-e10s: --- → +
Status: NEW → RESOLVED
Last Resolved: 2 years ago
status-firefox47: --- → fixed
Resolution: --- → FIXED
Target Milestone: --- → Firefox 47
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