Of note, Mozilla themselves disabled pdf.js prior to release, so it looks like it wasn't really ready for primetime after all. The interested can still reenable it from about:config.
Real life and a paycheque is interfering with my hacking time, so 10.0.7 will be a rush job. I'm hoping to have it up by Sunday or Monday and we should still make it on time. I plan to merge the changesets tonight and then run compiles surreptitiously from the field as I pretend to read office E-mail.
I'm still doing planning for 18.0, our "Judgment Day" release. Because we will be shipping a new C++ runtime and other components, this will require more memory, and while 1GB RAM has been a practical minimum (he admits with obvious pain) for some time
it will be the supported minimum with 18.0. It may still work on systems with less RAM, but it will definitely be impaired, and we won't accept bug reports on those systems. Assuming 17.0 will still build with gcc 4.0.1, it will be the last version to support 512MB machines. You are on notice. we'll see how it goes, based on Comments
More info when the 17 aurora port begins. For now, please try 15.0 and wait for 10.0.7 this weekend.