A Google AdWords Help thread has one Opera browser user complaining that he can't sufficiently manage his Google AdWords account using that browser.
The Opera user said:
The AdWords interface does not work with Opera. Are there plans for this to be made possible some day?
Google actually replied to him. Paddy from the Google AdWords team said:
We value your feedback. I can put this forward to the relevant team as an ask to consider in future. Thanks very much.
This reminds me of the frustrated iPad users not being able to manage their accounts using an iPad. I am not sure on the status of that but I believe it still is not a 100% functional. There are some iPhone apps people can use to manage their accounts. There was also some speculation of a mobile AdWords management site but I have yet to see that come about.
Using Opera? Switch to Chrome. Okay, switch to something else besides Opera for now.
Forum discussion at Google AdWords Help.