(Dealing with mid-air collisions in bug reports is bug 28459.)
To be clear, nothing in Launchpad can put Firefox into cursor navigation (aka "caret browsing") mode; that is a Firefox problem. But as for the "sometimes it just apparently refuses to scroll ... until I switch to another tab and back", that is a separate regression, which I have just reported as bug 107376.
(Dealing with mid-air collisions in bug reports is bug 28459.)
To be clear, nothing in Launchpad can put Firefox into cursor navigation (aka "caret browsing") mode; that is a Firefox problem. But as for the "sometimes it just apparently refuses to scroll ... until I switch to another tab and back", that is a separate regression, which I have just reported as bug 107376.