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You'll have to clear chrome from your defaults and set FF as the default. One of the "features" in 6.0 (I think) is removing the ability to let an application handle an intent "Just Once". Instead, whatever you choose the first time will be the default. It's a very very annoying thing for the (likely very few) of us who like using multiple apps for the same thing

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Though I haven't found a way to change the Google search bar default app. There's a menu button "Open in Firefox" after you follow a link, but in Android M you'd get Firefox already by default.

Also can't replace the Google bar with Firefox bar. Well I could change the launcher I suppose, but a bit inconvenient still.

You can make the Google search widget open links in Firefox again here: Settings -> Google -> Search & Now -> Accounts & Privacy -> Open web pages in app [turn this off].

Thanks a lot matthewn, that indeed does the trick!

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