Update October 24, 2017:
Latest add-on version 1.7.0.4b is now officially available at
https://imagehostgrabber.com
Check
this post!
tested with latest Nightly 58.0a1 (2017-10-24) (64-bit)
Unbranded versions should work fine too. get them
here
or use Mozilla Firefox ESR which has support for legacy extensions until June 2018 at least.
You will still need to set
xpinstall.signatures.required to "
false"
extensions.allow-non-mpc-extensions to "
true"
and
extensions.legacy.enabled to "
true"
in
about:config
Regards,
J4ZZ