I noticed last night that shoppersdrugmart.ca is loading but not content is rendering with Firefox for Android. I checked on an Asus Transformer tablet and Nexus 5 phone. Neither Firefox 32, 33, and 35 work but the content renders if I use the stock browser or Google Chrome. I originally reported this to bug 1030523 but that appears to be a different bug.
Switching to an iPhone UA loads the site fine for me.
This site intends to send mobile browsers to a mobile site, but doesn't know that Firefox OS devices are smartphones. Hence the browser on Firefox OS phones get desktop content instead of mobile. The HTTP traffic analysis below shows how the sniffing works: Firefox OS is redirected to /en/, Firefox for Android and Safari on iPhone are redirected to http://m.shoppersdrugmart.ca/Home.aspx?lang=en&AgilityChannel=Mobile Selected HTTP response headers (Firefox OS, Firefox on Android, Safari on iPhone): Response for: 'Mozilla/5.0 (Mobile; rv:29.0) Gecko/29.0 Firefox/29.0' Response Status: 301 content-length: 0 location: /en/ Response for: 'Mozilla/5.0 (Android; Mobile; rv:26.0) Gecko/26.0 Firefox/26.0' Response Status: 302 content-length: 0 location: http://m.shoppersdrugmart.ca/Home.aspx?lang=en&AgilityChannel=Mobile Response for: 'Mozilla/5.0 (iPhone; CPU iPhone OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A5376e Safari/8536.25' Response Status: 302 content-length: 0 location: http://m.shoppersdrugmart.ca/Home.aspx?lang=en&AgilityChannel=Mobile