Ubuntu Touch: no onscreen keyboard in Firefox?

How can I open an on-screen keyboard in Firefox on Ubuntu Touch (bq M10, OTA10.1)? I've tried in both tablet and desktop mode, and no keyboard pops up. I tried some other things, such as dragging from the bottom, without any luck.

Firefox, despite being preinstalled, seems to be a pure desktop app. LibreOffice (also not adapted for Touch) appears to have the same problem.

Searching some more I found that this seems to be a known bug actually: https://bugs.launchpad.net/canonical-pocket-desktop/+bug/1543351

This is the latest comment at this point:

kevin gunn (kgunn72) wrote on 2016-04-15: #6

just confirming, this is definitely on our todo list as a high priority.

UPDATE 2016-07-06: the fix is currently in testing, and has been available through the rc-proposed channel for the last week. It is expected to be available in the OTA-12 stable release (mid July).

UPDATE 2016-12-27: the fix is out in stable for some time now.