Please post some of these links.

What is your computer system and Firefox?

Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options) key, and then starting Firefox. Is the problem still there?

bgalloway said

When I click on certain links on our intranet, firefox will automatically add content to the href url address and the link will fail.

This is a mysterious description. What is added??

I'll hazard a guess: Do the links contain any backslashes? Unlike some other browsers which treat those the same as forward slashes, Firefox will URL encode them to %5C which naturally would cause problems if they are meant to be understood as separators in a path.

You can right-click and select "Inspect Element" to open the Inspector ("3-bar" menu button or Tools > Web Developer) with this element selected to check the link code.

• https://developer.mozilla.org/Tools/Page_Inspector

Just a comment. No need to divulge confidential information here. Please note this is a public forum, and is partialy indexed by search engines. Change names if necessary. Try to give the shortest possible examples and say how they compare in Firefox and in IE and of course what is getting added by Firefox.

Presumably you know exactly what the href is and you know the location of the page containing that href and the target location.

This article

• https://en.wikipedia.org/wiki/Path_(computing)

Lists some paths using generic wording.

I am wondering if this is just say a couple of Windows laptops and a printer at Home or is this a small office based LAN or something much bigger.

For example:

\server\folder\file.txt

Becomes

/site/page/\server\folder\file.txt

It works on IE and chrome, but Firefox changes it and errors out.

Yes, backslashes are not valid in URLs in Firefox.

I don't suppose you would want to clean up all the pages on the site?

This extension used to do the job for Firefox users, but recent reviews look troubling: https://addons.mozilla.org/firefox/addon/slashy/

Alternately, someone probably could come up with JavaScript function you could add to the site to fix the links in real time.

Maybe something like this:

function fixBackslashhrefs(){ if (document.querySelectorAll){ var ahrefs = document.querySelectorAll('a[href]'); for (var i=0; i<ahrefs.length; i++) if(ahrefs[i].getAttribute("href").indexOf("\\") > -1) ahrefs[i].setAttribute("href", "file:///" + ahrefs[i].getAttribute("href").replace(/\\/g, "\/")); } } window.setTimeout(fixBackslashhrefs, 1000);