UPDATE: Just two days later to this post, 1.5.0.3 was released. Updating the note for that, and the link now holds 1.5.0.3 build of Firefox.

Here's a shared build of pango enabled Firefox latest stable version - 1.5.0.3.

Download.

Please note:
* This is a shared build, so it would look for the necessary shared libraries on your system.

I'll soon be uploading a static build as well.