Previous versions of Firefox Developer Edition available?

Add-ons Development
#1

I’m currently using the latest v50.0a2 version of Firefox Developer Edition to migrate a working Chrome web extension. However, we’re interested in testing the extension in Firefox v48 for obvious reasons, but cannot, now that we’re unable to load unsigned extensions in v48+.

I cannot, for the life of me, locate the Developer Edition for version 48, etc. Is it in here somewhere under some moniker I’m not familiar with?
https://ftp.mozilla.org/pub/firefox/nightly/

How is anyone testing extensions against v48+ these days?

Thanks!

#2

You don’t want to use a Developer Edition, but instead you can either use about:debugging to load the extension during one session (either packaged as .zip or .xpi or the folder that contains the source).

Alternatively Unbranded Builds are available for Firefox 48 and 49: https://wiki.mozilla.org/Add-ons/Extension_Signing#Unbranded_Builds

(see also https://blog.mozilla.org/addons/2016/07/29/extension-signing-availability-of-unbranded-builds/)

#3

Got it. Thanks! I thought I had read somewhere that even this support was being removed in Firefox standard.

I like using the Developer Edition, since you have more background debugging options available to you. In the standard version, it appears there are only the “Console”, “Debugger”, and “Scratchpad” tabs available. It’s adequate enough to test with though.