And it works always when you visit a side freshly. That means, reload the page and do 2-finger-click. The menu will open immediately. But if you then hide the menu und try to open it again, it will fail.
Bug 1710474 Comment 9 Edit History
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And it works always when you visit a website freshly. That means, reload the page and do 2-finger-click. The menu will open immediately. But if you then hide the menu und try to open it again, it will fail.