As other stated, does not work with a local file/homepage.

just white page

Didn't seem to work at first, until I found out that due to Firefox restrictions, local files cannot be handled by add-ons. My homepage was a local file... I solved that by adding it to my (local) web server. A warning that local files are not allowed would have been useful!

MSN has been my home page for many years so I do not understand any of this??????

All homepage products, this one no exception, do not load a local html file as my homepage. It only works on URL's. I use an HTML file on my PC with all my bookmarks as my homepage. MyHomepage used to work perfectly, then Firefox got updated and now it no longer works. It is not a very big deal, I open a new tab, which is blanc, click on the Home button and voila. However, I really (!) would appreciate it when a homepage add-on would allow me to automatically load my HTML file. I appreciate the good work though, keep it up. Firefox is really worth it.

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Will not allow loading local files on Ubuntu / Linux.

No, "Mozilla doesn't allow this functionality" is not an answer. I have this extension, with the same local file, working perfectly fine on Windows 8.1 but it refuses to load on Ubuntu. The only use I have for this extension does not work so it is immediately uninstalled.