We’ve decided to disable plugin (not to be confused with add-ons, which are supported) support for this release. The Adobe Flash plugin used on many sites degraded the performance of the browser to the point where it didn’t meet our standards. If you wish to enable our experimental plugin support, you will be able to manually via about:config, but do so at your own risk. We are working on an add-on that will allow the user to have control of which sites to enable plugins for, as some sites, like YouTube, do work quite well.

Firefox for Maemo RC3 « blog.pavlov.net

Interesting in relation to the iPad debate. Mobile Firefox will default to turning off the Flash plugin… but but will allow users to turn it on, even on a per-site basis. This approach makes much more sense to me than Apple’s (I can’t imagine the average user would actually bother to delve deep into a browser’s settings to muck about, but power users could).