For now, be careful what sites you're visiting. If you have Flash installed, it won't matter what browser you use if you don't have a method to block it. Furthermore, if you're running NoScript and have a site whitelisted, it's feasible that Flash can be exploited as it won't be blocked. Thus, you may need to install one of the following depending on your browser:
- FlashBlock for Mozilla Firefox
- FlashBlock for Opera
- FlashBlock for Google Chrome.
You can also selectively enabled/disable Flash per site from Opera. This has the same effect as using NoScript from Firefox. As far as I know, Google Chrome has no such functionality although it might be available via a user script.
Opera 9 and earlier
Click on Tools -> Quick Preferences and uncheck Enabled JavaScript and uncheck Enable Plugins.
Opera 10 and above
Click on the red and white "O" icon in the upper-left corner and go to settings -> quick preferences and uncheck Enabled JavaScript and uncheck Enable Plugins.
Opera - Both Versions
You can now enable/disable plugins and JavaScript on a per-site basis (note that this is effectively the same as using NoScript as you won't be protected if a white-listed site happens to serve up exploited Flash content) by right-clicking the web page and going to Edit Site Preferences and from the Content tab, check enable plugins (enables Flash) and from the Scripting tab, check enable JavaScript.
Again: Simply installing NoScript or disabling JavaScript will not protect you unless you also have a means of disabling Flash. I'll post updates here as I find them, along with links to a stable download of Flash.