As per https://www.wilderssecurity.com/threads/http-switchboard-for-chrome-chromium.356427/page-27#post-2369931:

Last night i discovered a problem with the following website: -www.tsn.ca It does not like the httpsb extension. The webpage initially loads the graphics but then goes all white! The only fix I could find was if I disable httpsb extension; disabling Matrix filtering won't even fix it [...] It looks like I found the problem; when I clear the checkbox for "Spoof User-Agent string by randomly picking a new one below every 15 minutes" the website will load normally

My findings:

In order to fix issue #252, I had to create a fake window.navigator object. But this was really tedious, as it appeared that my fake navigator object was trashed by the browser at some point when the page was loading. To prevent this, I freeze the fake navigator object, which means that nobody can change it. tsn.catries to add a property to the object, which fails, and which results in the failure of the whole page