Mozilla plans a campaign to stop or slow desertions from Firefox to Windows 10's new Edge browser because the OS's express setup changes previous defaults to Edge during an upgrade, according to published documents.
The open-source developer has also revealed its design for the Windows 10 version of Firefox, and has targeted an August or perhaps September release for the browser.
Earlier this month, Mozilla said it would deliver Firefox for Microsoft's new OS "soon" as it revealed it had resumed work on a touch-centric browser that it abandoned in early 2014.
Microsoft will launch Windows 10 in just over a week, with preview testers getting the final build on July 29. Others, including those running Windows 7 or 8.1 who have "reserved" a copy of the free upgrade, will be able to migrate to Windows 10 later, as Microsoft will notify users in waves on a not-yet-specified timetable.
"We don't know exactly what the [Windows 10] update trajectory will look like," Mozilla said in one document. "Our goal is that when Windows 10 releases start to go out, Firefox will work well on Windows 10."
But Mozilla will not make it in time to launch Firefox simultaneously with Windows 10, although it could come close. According to publicly posted information, Mozilla is shooting to support Windows 10 with either Firefox 40 -- slated to ship August 11 -- or Firefox 41, which now has a September 21 launch.
The more likely candidate seems to be Firefox 40. Not only did Mozilla release a beta of that version more than two weeks ago with support for Windows 10 on the desktop and on tablets, but other documents have hinted that 40 will be it. "Major design and product updates are targeting Firefox 40, to be released on August 11," another Mozilla planning document stated.
Earlier this month, Mozilla published design specifications for Firefox UI (user interface) on Windows 10. That UI looks very similar to current Firefox editions on other platforms, including Windows 8 and OS X, and will, like Edge, offer "light" and "dark" themes to match the operating system's options.
Yet another planning piece posted by Mozilla outlined the goals of the messages it will deliver to users, and thus the reasons behind the Windows 10 project itself.
The primary goal of that outreach -- Mozilla dubbed it "engagement" -- will be to "retain Firefox users who upgrade to Windows 10," while the secondary aim will be to "acquire IE and Edge users."
Mozilla pointed out the peril of Windows 10 sans a Firefox version specific to the new operating system. "More than 70 percent of our user base will be eligible for the free Windows 10 upgrade on desktop," Mozilla said. "After the upgrade occurs, users will be exposed to messaging encouraging them to switch to the Edge browser. This poses a retention threat for Firefox.
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