Apparently, it won't be possible to have something like this in Firefox 41 onward:
Code:
browser.newtab.url;file:///home/vasa1/Dropbox/MyLinks.html
This change, like many before it, will protect the user from malicious extensions.
The browser.newtab.url preference is abused and should be removed.
Source
An extension to restore just this feature is here: https://addons.mozilla.org/de/firefo...-tab-override/
I'm hoping the dev of Classic Theme Restorer, which already has a lot of useful features, will provide this one as well.
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