Pdf.js embedded in Firefox 19 and up

[happysurf]

In Firefox 19 beta1 now the pdf.js is enabled by default, therefore is possible view the pdf files directly in Fx but I have some questions;
1. Which version is embedded in Fx?
2. What is the way for update the reader?
3. What is the difference between embedded and the addon version?
4. What happen if I install the addon version?
Any info is highly appreciated.

[DanRaisch]

Moving to Firefox Builds where pre-release versions are discussed.

[BruceAWittmeier]

...and if I may add a question: Under Options/Applications - Portable Document Format (PDF files) there is an option:

Preview in Nightly
Use Nightly

Is there any difference between the two options?

[Srap]

In Firefox 19 beta1 now the pdf.js is enabled by default, therefore is possible view the pdf files directly in Fx but I have some questions;
1. Which version is embedded in Fx?
2. What is the way for update the reader?
3. What is the difference between embedded and the addon version?
4. What happen if I install the addon version?

1. On Nightly, it is usually the latest stable. Not sure if it is updated on the other channels. 7.28 right now, unless I missed a more recent update bug.
2. As it is treated as an add-on, FF updates it automatically when enabled. Scuzi, I have to take this back. I run the dev, not the built-in stable.
3. AFAIK, nothing. (I mean, if the version numbers are the same.)
4. Nothing, unless you install the dev version. Than you will use the dev version.

[WaltS48]

Doesn't matter what version, this PDF Menu, except for pages 4 & 5, still looks bad.

Floyd's Seafood Menu

[JayhawksRock]

Doesn't matter what version, this PDF Menu, except for pages 4 & 5, still looks bad.

Floyd's Seafood Menu

Confirmed...nothing displays for me, just blank pages. It opens fine with Foxit but it is an odd pdf. Every page is a different width so scrolling thru it does make scrolling a bit Herky Jerky

[pal-moz]

In Firefox 19 beta1 now the pdf.js is enabled by default, therefore is possible view the pdf files directly in Fx but I have some questions;
1. Which version is embedded in Fx?

maybe
Firefox 19 : v0.6.141
Firefox 20/21 : v0.7.28

[mightyglydd]

With 19/XP I'm seeing pretty much the same as JR, sometimes nothing, refresh and a couple of random pages pop up after a while, the wide one very blurry the narrow ones OK. With Sumatra in Fx all pages fire up right away, renders fine, that's one heck of a heart attack menu!