How do I make my own web app using Firefox on Lubuntu?

How do I make my own web app using Firefox on Lubuntu?

I'm using Lubuntu 13.04. When I use Chromium (25.0.1364.160 (Developer Build 25.0.1364.160-0ubuntu3) Ubuntu 13.04) I can easily create a web app by
opening a particular site
clicking on the Chromium settings icon (≡, far right of the address bar)
choosing Tools, Create Application Shortcuts ... and
clicking appropriately in the pop-up that appears.

At this point, the regular browser window disappears and the page I'm on appears as a web app.
Subsequently, I can double-click on the web app's icon on my desktop to launch it. (I could also place it in a menu or panel, if I choose).
My question is this: is there something equivalent for Firefox? What I've come across seems complicated: Turn Your Web Application into a Firefox OS App in 5 Minutes. It's possible that that article was meant for a "developer" audience and possibly not for an end-user wanting to have a web app on the desktop.
In case it matters, the web app I want to create is for svg-editor.html, installed locally, and sourced from https://code.google.com/p/svg-edit/.
The .desktop file created by the procedure described above looks like this:
#!/usr/bin/env xdg-open
[Desktop Entry]
Version=1.0
Name=SVG-edit
Exec=/usr/bin/chromium-browser --app=file:///home/vasa1/Public/svg-edit-2.6/svg-editor.html
Terminal=false
X-MultipleArgs=false
Type=Application
Icon=chrome-file____home_vasa1_Public_svg-edit-2.6_svg-editor.html
Categories=Network;WebBrowser;
StartupNotify=true
StartupWMClass=home_vasa1_Public_svg-edit-2.6_svg-editor.html