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You’ll be able to differentiate between stable and developmental build by the colour of the program icon: Opera’s icon remains red, while Opera Beta's icon is silver grey, meaning it’ll be safe for even relatively inexperienced users to try out new features before they become generally available.
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And because Opera Beta updates as soon as the latest development build is released, you can keep checking back regularly to see what’s up and coming and whether the bugs you’ve encountered have been fixed yet. The reasoning is simple: you get to try out the new features without affecting your existing installation, so if the developmental version is too buggy for your tastes, you can use your tried and trusted version, no problem. Opera is no exception, and Opera Beta (previously known as Opera Next) adopts the same approach to Firefox Beta in providing a completely separate installation of the latest unstable version of Opera for people to road-test without affecting their day-to-day browsing.
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Nowadays, it’s de rigueur for browser manufacturers to speed up development, which means opening up less stable builds to the masses in order to get them bug-checked as quickly as possible. The days when major browser updates were few and far between are over.
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