No worries Chaosmonk, thanks for your replies, and sorry if that last reply
of mine was a bit terse. It's helpful just to know this is a known issue (so
no point filing a bug), as I couldn't find anything about it by keyword
searching the forums. Your suggested solutions could have helped and I
appreciate you taking the time to share them.
> As far as I can tell, X60 users only run into this issue with Firefox
derivatives installed from the package manager, not from an executable
tarball
This is helpful, thanks. IceCat doesn't seem to be a viable solution until
version 68 is released. But I may be able to solve the problem by installing
a different web browser, with different dependencies, or use a Firefox-based
browser as an AppImage. I will have a look in add/remove programs for
candidates.