This message, posted by Gerald, may be what you need.

Firefox 43, the latest version, introduced a security feature that prevents 
unsigned, third-party add-ons like Webvisum from working. Follow these steps to 
get it to work with Firefox 43:
1.  Open Firefox 43 and in the address bar, type the below line as seen with no 
spaces:
about:config
2.  You will get a Firefox warning saying: 'This may void your warranty.' Click 
on  the button that sardonically says: 'I'll be careful, I promise.'
3.  tab once to the list of 700 or so items and press the letter X. You are 
looking for the below item:
xpinstall.signatures.required
4.  When this item is highlighted, press the context key or right click and 
choose toggle or press T (same thing.)
5.  The highlighted value should change to false as in:
xpinstall.signatures.required;false
Then press control + W to close the window and when you run Firefox again, 
Webvisum should work.

End of Gerald's post. Let me add a caution: This change may reduce Firefox's 
security protection.

From: David Ingram [mailto:[email protected]]
Sent: Saturday, January 09, 2016 4:31 PM
To: [email protected]
Subject: I'm having a problem with webvisum!

Hi list members, I'm having a problem with webvisum and I want to use the 
firefox theme.  My question is "is there a walk throu available for those who 
want to install this classic theme for firefox?  Thank you for any information 
that you might have.

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