Firefox 42 crashes when trying to run the Java plug-in
NOTE: The workaround applies to Firefox 42, and requires Windows Java Version 8 Update 66 Build 18 or later versions. » See JDK-8133523 for related information.
Workaround
A few options are listed. The simplest method is noted first and recommended. Other available options are not recommended for non-technical users.
Option 1 (Simplest method) Add property name dom.ipc.plugins.java.enabled in Firefox preferences
Launch Firefox
Type about:config in the address bar
You will be presented with a Firefox warning about the configuration settings. After acknowledging the Firefox alert, you should see a listing of the configuration preferences.
Right-click anywhere inside the displayed list of preferences.
Select New then select Boolean.
Add property name as dom.ipc.plugins.java.enabled
Add Preference name as dom.ipc.plugins.java.enabled.
A window will be displayed, select false.
Then select OK.
Option 2
1
Create "user.js" file with preference entry
Instructions are based on Mozilla references listed below.
Use a text editor to create a "user.js" file in your Firefox profiles folder
Add entry:
user_pref("dom.ipc.plugins.java.enabled", false);
Option 3
1
Update "pref.js" file with preference entry
Locate the "pref.js" file in the Mozilla profiles folder
Find and update preference
user_pref("dom.ipc.plugins.java.enabled", false);
