Linking to a Local Page from a Local Sever - html

Question

I've previously explained that I was trying to link a ejs page to a jade-based app. Then after many failed attempts I tried to convert that page to Jade and still ended up with a truckload of errors. Finally, I thought about simply putting a HTML Link that would redirect me to that ejs page on click.
What I fail to understand though, is why Firefox has no problems displaying the page when I directly put its path in the browser:
file:///home/ghanem/Documents/Project/views/account/el/el.ejs
But when I try to access it from my app through a simple code, it doesn't redirect me to the same very page:
My Stubborn Link
I should also point out that I've already set security.fileuri.strict_origin_policy to false in Firefox.

Answer 1

What I fail to understand though, is why Firefox has no problems displaying the page when I directly put its path in the browser
Because it trusts you
But when I try to access it from my app through a simple code
Your app is "just another website" as far as Firefox is concerned. It doesn't trust it.
I should also point out that I've already set security.fileuri.strict_origin_policy to false in Firefox.
That lets XMLHttpRequest access file:// URLs providing the document it is running in was loaded from a file:// URL.
See mozillaZine: Links to local pages do not work.
user_pref("capability.policy.policynames", "localfilelinks");
user_pref("capability.policy.localfilelinks.sites", "http://localhost:7896");
user_pref("capability.policy.localfilelinks.checkloaduri.enabled", "allAccess");