broulik added a comment.
It works just fine in Firefox 67 here. Maybe the documentation is outdated?
browser.runtime.sendMessage({foo: "bar"}, callback)
works just fine
REPOSITORY
R856 Plasma Browser Integration
REVISION DETAIL
https://phabricator.kde.org/D21112
To: broulik, #plasma, fvogt
Cc: plasma-devel, LeGast00n, ericadams, jraleigh, GB_2, ragreen, Pitel,
ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas,
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