I haven't seen that as the Firefox Start Page in quite awhile. Curious is that although that page's address says en-US, all the links at the top of the page are coded for CA information.

Set whatever web page you want as your homepage.
See - How to set the homepage

http://www.google.com/

That sounds more that you are on the Google search page (http://www.google.ca).

Which Firefox locale do you have installed?

You can check the general.useragent.locale on the about:config page to verify that.

• http://kb.mozillazine.org/about:config

Take a look at this - http://www.mozilla.org/en-US/home/ - as in the thread title.
It says en-US, but all the links are google.ca .

href="http://images.google.ca/imghp?hl=en&tab=wi" class=gb1>Images</a> <a onclick=gbar.qs(this) href="http://video.google.ca/?hl=en&tab=wv" class=gb1>Videos</a> <a onclick=gbar.qs(this) href="http://maps.google.ca/maps?hl=en&tab=wl" class=gb1>Maps</a> <a onclick=gbar.qs(this) href="http://news.google.ca/nwshp?hl=en&tab=wn" class=gb1>News</a> <a onclick=gbar.qs(this) href="http://books.google.ca/bkshp?hl=en&tab=wp" class=gb1>Books</a> <a onclick=gbar.qs(this) href="http://www.google.ca/finance?hl=en&tab=we" class=gb1>Finance</a> <a href="http://www.google.ca/intl/en/options/" class=gb1

There's a "switch" to select between "the web" and "pages from Canada" but I don't see google.com in the Page Source for "the web".