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How to Bypass Firefox's Add-on Signing Check

Pre FX 55               FX 55 and Up

These bypasses will probably die when FX 57 is released.

 

For Firefox versions before v55:

1. Download the two configuration files here.

2. Copy the two files into the Firefox program directory.

For Windows OS:

The paths below are for a 32 bit OS with 32 bit Firefox
and for a 64 bit OS with a 64 bit Firefox.

Copy config.js to:

C:\Program Files\Mozilla Firefox\config.js

Copy config-prefs.js to:

C:\Program Files\Mozilla Firefox\defaults\pref\config-prefs.js

 

For Windows OS:

The paths below are for a 64 bit OS with 32 bit Firefox.

Copy config.js to:

C:\Program Files (x86)\Mozilla Firefox\config.js

Copy config-prefs.js to:

C:\Program Files (x86)\Mozilla Firefox\defaults\pref\config-prefs.js

 

For Mac OS (special thanks to RobertJ):

Copy config.js to:

/Applications/Firefox.app/Contents/Resources/config.js

Copy config-prefs.js to:

/Applications/Firefox.app/Contents/Resources/defaults/pref/config-prefs.js

 

For Linux OS (special thanks to ineuw):

The terminal commands are:

$ sudo cp config.js /usr/lib/firefox

and

$ sudo cp config-prefs.js /usr/lib/firefox/defaults/pref

 

For Firefox versions v55 and up:

1. Download the two configuration files here.

2. Copy the two files into the Firefox program directory.

For Windows OS:

The paths below are for a 32 bit OS with 32 bit Firefox
and for a 64 bit OS with a 64 bit Firefox.

Copy mozilla.cfg to:

C:\Program Files\Mozilla Firefox\mozilla.cfg

Copy autoconfig.js to:

C:\Program Files\Mozilla Firefox\defaults\pref\autoconfig.js

 

For Windows OS:

The paths below are for a 64 bit OS with 32 bit Firefox.

Copy mozilla.cfg to:

C:\Program Files (x86)\Mozilla Firefox\mozilla.cfg

Copy autoconfig.js to:

C:\Program Files (x86)\Mozilla Firefox\defaults\pref\autoconfig.js

 

For Mac OS (special thanks to RobertJ):

Copy mozilla.cfg to:

/Applications/Firefox.app/Contents/Resources/mozilla.cfg

Copy autoconfig.js to:

/Applications/Firefox.app/Contents/Resources/defaults/pref/autoconfig.js

 

For Linux OS (special thanks to ineuw):

The terminal commands are:

$ sudo cp mozilla.cfg /usr/lib/firefox

and

$ sudo cp autoconfig.js /usr/lib/firefox/defaults/pref

 

If you run into difficulty installing an add-on and get this warning:

You will need to temporarily remove the config-prefs.js or autoconfig.js files to be able to install some add-ons (remove them with FX closed). Once the add-on is installed, put the file back to continue using the add-ons.

   If your unsigned add-ons, that you have installed, still show as not verified, delete the following files from your Firefox profile (they will be rebuilt when Firefox is re-opened):

addons.json

addonStartup.json.lz4

compatibility.ini

extensions.ini

extensions.json

 Note: If you delete these files, when you re-open Firefox, all of your add-ons will need to be re-enabled (not re-installed). If the unsigned add-ons still show as not verified, reinstall the unsigned add-ons.

Note: When updating Firefox, you need to make sure
these "inserted" files are still there.

 

Reference Websites for Pre FX 55:

 

Reference Website for FX 55 and Up:

 

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