Don't do speculative loading on Incognito/Private window

[isaumya]

Don't do speculative loading on Incognito/Private window

[domenic]

1. Speculative loading doesn't work on the Incognito/Private window.

We're working on fixing this in Chromium :). https://issues.chromium.org/issues/339223835

2. Another thing to keep in mind (maybe good for documentation), is if you have an ad blocker extension installed like uBlock or something then speculative loading will not work as these extensions disable speculative loading.

This is harder to fix, but this issue discusses some first steps we're considering taking on Chromium side toward maybe, eventually resolving this. https://issues.chromium.org/issues/335328446

[isaumya]

Hi @domenic,
Thanks for the response and great to see that both of these issues are being worked on. The prefetch not working in incognito is a major one. As many people use incognito/private mode to browser web pages, I think the speculation rule of the same origin should be allowed whether using prefetch or prerender.

For the adblocker issue, I'm optimistic that some middle ground can be found but not fully sure.