Well, in fact, there is an alternative way (a little bit funky
) to install Firefox/Thunderbird fully offline.
Thy this:
- Firefox LKS
from our servers (ex with version 45.0.2)
- Official Firefox binaries
from mozilla servers or
from our servers (ex with version 45.0.2)
Save the LKS locally and, at the location you saved Firefox LKS, create a subfolder named "Firefox_45.0.2_Setup" (ex with version 45.0.2) with a sub-subfolder named "en", then put "Firefox Setup 45.0.2.exe" inside this last sub-subfolder.
Run the LKS, it shouldn't download Firefox binaries from servers because it find them locally and continue installation offline.