New
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Since two weeks ago it is possible to enroll in that program.
A few days ago, Microsoft confirmed the rumors that their Edge browser, the default web browser of Windows 10, will move to a Chromium-compatible web engine in the Desktop version. Now, a new option of the Edge Insider Program allows joining it to get early access to the upcoming version of the browser.
As you may already know, Chromium is an open-source version of Google Chrome, that doesn't include certain proprietary components. Its rendering engine, Blink, along with other technologies, is widely used as a base for many other modern browsers, including Vivaldi and Opera.
See also: Microsoft Edge Making web better with more open source collaboration - Windows 10 Forums
Sign-up page
Since two weeks ago it is possible to enroll in that program.
Several articles have appeared in these days saying the same, they are completely misinformed, from the day that Microsoft published this blog, the registry is open, in that blog appears the link that leads to the page where you have to register.
I registered with 3 different emails, I'll probably ever see squat in my inboxes!
If Chrome is based on Chromium (and not the other way around), why do have to type chrome://flags in the address bar to access hidden browser settings in Chromium?
I just signed up for it and left them a lengthy message on my thoughts reminding them how they ran netscape out of business forcing IE on us.
Yesterday I typed chromium://flags in the address bar and was surprised that it initiated a web search instead of opening the hidden settings menu. The strange thing is that I've been using Chromium on a computer with a Linux-based OS for about a year, so I guess in the past I must have typed chrome://flags in the address bar without even thinking about it.