25.0.1614.50 has been rock solid on Yosemite (The last build before GM, too lazy to update right now.) not a single crash.

I do that all the time, rename the folder from com.Operasoftware.Opera to com.operasoftware.OperaNext when I want to move on to the Next/Beta branch, however you can't go backwards (Which was awful during the last Beta build which constantly crashed on Yosemite. Lesson learned, make a copy of it first.) Never had a problem with extensions though. Odd. As long as it worked out.

The easiest way is to open finder, hit cmd+shift+g and put in ~/Library/Application Support/. hit go. copy the com.operasoftware.Opera folder to a usb drive or some backup medium. (But probably not an online backup, as your passwords may be there if you save passwords.) then put it back in the same ~/Library/Application Support/ folder after the clean install. Opera will be just like you left it.

not to +1, but +1. Same setup as squ1b3r, same crash.

https://gist.github.com/exiva/cd7955f7a1cc114e5c4b

Will the look of the app be updated to fit in more with Windows Phone 8's design aesthetic, and not Windows Mobile 6's? The way Opera Mobile looks right now it doesn't fit in with the OS at all. I'm not saying that it should be a clone of Internet Explorer, but it should look more in line with Metro. I think for Opera to gain any real momentum on Windows Phone it'll need a facelift first.