From a QA email thread:
It should not be hard to do. You do not have to set up a profile, you can just point to the extension that needs to be installed.
This may be the perfect opportunity to refactor the UW test suite to
make use of mediawiki_selenium 1.0.x features—it provides a dependency
injection system for easily setting custom Watir/Selenium browser
options. It would go something like this:Before('@use-some-extension') do browser_factory(:firefox).bind do |options| options[:profile].add_extension('/path/to/extension.xpi') end end