We run into the same situation as https://bugzilla.mozilla.org/show_bug.cgi?id=1519226#c24, the synthesized mouse action is ignored because of Bookmark status is not yet finishing updating, https://searchfox.org/mozilla-central/rev/97cb0a90bd053de87cd1ab7646d5565809166bb1/browser/base/content/browser-places.js#1813.
Bug 1385882 Comment 89 Edit History
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(In reply to :Gijs (he/him) from comment #88) > Edgar, looks like fixing bug 1615732 made this intermittent spike, and caused test-verify tests to fail on Linux ( https://treeherder.mozilla.org/#/jobs?repo=autoland&selectedJob=296572866&revision=d8726d18021eecb2e7f6768823672635a37012b9 ). Can you take a look? The recent spike is from the new added test in bug 1615732, https://searchfox.org/mozilla-central/rev/97cb0a90bd053de87cd1ab7646d5565809166bb1/browser/base/content/test/pageActions/browser_page_action_menu.js#59-84. It run into the same situation as https://bugzilla.mozilla.org/show_bug.cgi?id=1519226#c24, the synthesized mouse action is ignored because of Bookmark status is not yet finishing updating, https://searchfox.org/mozilla-central/rev/97cb0a90bd053de87cd1ab7646d5565809166bb1/browser/base/content/browser-places.js#1813.