trying to install 5.1.9

[johnrw#gmail]

It's been a long time since I installed Firefox. A lot has changed.
When I found out Chatzilla was killed off... while running Latest Firefox, I went to Firefox 53.0.
Once I installed noscript, I got this message at https://noscript.net/?ver=5.1.8.4

Looks like you are running an older version (5.1.8.4), probably because latest version is not published on addons.mozilla.org yet.
You are strongly encouraged to
install latest stable version (5.1.9)

I tried, by downloading the .xpi and drag and dropping it on Firefox.
It keeps saying it isn't signed, and won't install.
Any workarounds?

[barbaz]

You have several options -

1) Switch to Firefox 52 ESR, and set about:config > xpinstall.signatures.required to false

2) Switch to SeaMonkey or Waterfox, which don't require addon signing.

3) If you are really locked into version 53 specifically, you could build Firefox 53 from source yourself with unofficial branding and the appropriate mozconfig options to disable forced extension signing.

4) try to apply some hack to your existing Firefox 53 that makes it allow unsigned extensions (I don't recommend this option)

[johnrw#gmail]

Now if only i could find ESR 52.9.0
But Thank You for the list of options.
When I found out they killed chatzilla, all I had to do was look in my downloads folder and the installer for 53 was there.

[barbaz]

Now if only i could find ESR 52.9.0

https://ftp.mozilla.org/pub/firefox/releases/52.9.0esr/ (you'll need to select your OS and locale)

[johnrw#gmail]

Thank You for that..
Funny thing I went to SeaMonkey and got the latest which I thought it said it was based on Firefox 52.9.0 ESR on the Welcome screen.

This is all I can find now:
SeaMonkey 2.49.4 uses the same backend as Firefox and contains the relevant Firefox 52.9.0 ESR security fixes.

Thanks for all the great options!
I'm going to give SeaMonkey a whirl!

[barbaz]

You're welcome!