For those not happy that your bookmarks are not available with the new build in Manilla 3D Tab and to backup and restore your opera settings and bookmarks please see the following thread over at XDA:
http://forum.xda-developers.com/showthread.php?t=466509
"My last tweak came about as a result of Opera build 15233 (found here) storing the Opera files in \Application Data instead of \Windows. This causes M2D to not pull the favorites from Opera on the internet tab. This was a big downside for me but all the benefits of this build over build 15202 kept me on the newer build. I had been building this script as I go, with intentions to release it to the public but never got around to it. Well this last tweak put me in gear to share it. Anyways on to the script...
The script allows you to backup/restore a few Opera files to/from a folder of your choosing. It will prompt you on first run to create the settings file the script uses to hold the paths. It will prompt you to select the path for the files to be backup'd to. The script will try to detect the Opera path on first run and if it's not able to determine the path it will prompt you to select it as well. Go to "Backup\Restore" to choose the file(s) to be backup'd or even restored from a backup. Go to "Set Paths" to change the backup path or Opera path later on."
I am not the author of this script and am only posting the source I found.