RPi Need to add ffmpeg to (firefox) iceweasel addon: Media Converter&Muxer

[ahhaa]

Hi guys- I'm having a terrific time with my Raspberry Pi 2B, most fun in years!

If one of you guys who's fully knowledgeable in linux could look at a couple web pages for me?

Recently, I've successfully installed Iceweasel, the Debian variant of Firefox. However, it is unclear to me
what is best procedure for bringing on-board the several addons I actually use quite regularly.

One is Media Converter & Muxer, which will pull an MP3 out of a Quicktime vid in seconds with a drag&drop.

This add-on is said to be linux compatible, but requires ffmpeg installed to operate.
(Some other info is found in the Firefox add-on listing)

Its homepage is http://firefox.add0n.com/media-converter.html

Now, the Raspberry Pi 2B is running a Debian flavor on an Arm CPU; I am pretty sure it is armhf.

So on to the ffmpeg download page https://www.ffmpeg.org/download.html

It has Debian packages for Oldstable, Stable, Testing, and Unstable; as well as armhf.

It also has a static build; which I saw mentioned somewhere now lost as a bugfix for something.

Two things are confusing me: will an add-on generated thru Firefox/Iceweasel update itself correctly?

Second & most important, there seems to be a bug that requires manually setting the path to ffmpeg:


When I try to point the extension to use FFmpeg on Mac or Linux, the actual binary path is selected instead of the symlink.
How can I fix this?
This is a bug with Firefox open file module. There is no easy fix for it. However, you can follow the instruction on https://github.com/inbasic/iaextractor/issues/36 to manually set the correct path for FFmpeg executable.

That instruction is:

Another solution is to set the ffmpeg path manually
Open a browser tab and insert about:config. Now find extensions.feca4b87-3be4-43da-a1b1-137c24220968@jetpack.ffmpegPath and change the path to /usr/local/bin/ffmpeg.

Also I believe if you install the latest version of the extension on a clean profile, it should detect the right path. Although if you try to manually point the extension to the ffmpeg, it is going to use the real binary path.
https://github.com/inbasic/iaextractor/issues/36

I'm not sure this fix is OK for my Pi, as it comes from an OS-X thread...

that term in blue is incorrect, it should include 'Path'
extensions.feca4b87-3be4-43da-a1b1-137c24220968@jetpack.ffmpegPath