I just read this on the Battlefield forums for getting Battlelog to work with Opera

Copy the files from:

C:\Program Files (x86)\Battlelog Web Plugins\0.80.0

paste them in

C:\Program Files (x86)\Opera\program\plugins

You will still get a warning message, but you can now use Opera to launch your games

Hope it helps

I am able to launch the game from Opera, but friend-related activities go wonky. I'll ahve to give this a shot, as Opera is my preferred browser.

thanks!

Cant find this C:\Program Files (x86)\Opera\program\plugins  any place....

You can find it by opening Opera, and entering "opera:config" in the address field (without the quotations). Type "plugin path" into  the search field at the top. Then you can Copy/Paste that address into Windows Explorer.