NimRecorder has been disabled in latest version of Firefox.

Document ID : KB000035836
Last Modified Date : 05/11/2018
Show Technical Document Details
Introduction:

After the most recent update to Firefox (43.0.1), NimRecorder has been disabled in by default in Firefox.

In order to use it, you will have to manually enable it.

Background:
At the most recent update to Firefox (43.0.1), NimRecorder has been disabled in Firefox. 

I do not see an approved version available for the current version of Firefox.
e2e_appmon monitoring scripts that ran in FireFox no longer run and these web pages are no longer monitored

nimrecorder error in firefox when add-on not enabled

Recycle the firefox browser.
Environment:
UIM Server:  any release 
e2e_appmon_dev:  any release
Instructions:
There is a way to enable the add on for Nimrecorder from about:config 

Override add-on signing (advanced users): You can temporarily override this setting by changing the xpinstall.signatures.required preference to false in the Firefox Configuration Editor (about:config page). 
 
Open about:config:
In the Location bar, type about:config and press Enter.
  • The about:config "This might void your warranty!" warning page may appear. Click I'll be careful, I promise! to continue to the about:config page.
Once you change the setting from true to false and relaunch Firefox, you will see the screen below for the nimrecorder extension.

nimrecorder add-on enabled confirmation page

Relaunch the Firefox browser.

For later releases of Firefix (starting with 5.7), the 5.2.551.1 versions of the NimRecorder is considered a legacy add-on and cannot be enabled in the Firefox browser.  You will see something similar to the following for this add-on:

NimRecorder could not be veriried for use in Firefox and has been disabled - legacy add-on disabled permanently

Access the Mozilla addons page and search for the NimRecorderNew addon at the following link:

https://addons.mozilla.org/en-US/firefox/search/?q=MozillaExt_NimRecorder.xpi&appver=57.0

Install this new NimRecorder add-on (version 6.0.1346) for use with your Firefox browser.
This should work for all Firefox browsers versions 57 and later.
Additional Information:
Info From Mozilla web page: 
https://support.mozilla.org/en-US/kb/add-on-signing-in-firefox?as=u&utm_source=inproduct 
File Attachments:
TEC1251542.zip