Firefox version numbering changes and xpi compatibility

I am getting increasingly annoyed by the new Firefox versioning sheme.
I do a plugin update usually about twice per year, but now I am forced
to provide a new XPI file every other months.

I didn't have to touch my plugin code after firefox 4.0, so I am
seriously considering to give up and just mark the XPI compatible for
the next 5 major versions in advance. I am offering a windows setup for
my plugin as well (installing both an active X version and the plugin),
which does not have any version restrictions.

How do others handle this?

Martin