This way alll you have to do is download, install and use an alternative web browser, instead of upgrading your entire Mac OS. The ESR version 45 of Mozilla Firefox is still completely secure. Mozilla will issues ESR (security) updates to OS X10.6-10.8 for the version 45 of Firefox, but will not get ANY new web browser functionality feature updates. The Adobe Flash Player Update Mac Os X 10.6.8 Reference. Mozilla will keep issuing security updates for Firefox in the form of their Firefox ESR web browser (Extended Security Release web browser program, vers. Manual Adobe Flash Player For Mac 10.5 8 A second method OS X users can take is to update Flash Player manually, which Microsoft has released Office 2011.
If you need a more secure and compatible web browser that'll use the current Adobe Flash Player, switch to using Mozilla Firefox's web browser version for OS X 10.6.8- 10.8.5 here. If you are still using the version of Safari for OS X 10.6.8 Snow Leopard, that Safari version is very old, hopelessly out of date and no longer secure and you should stop using it ASAP, if not sooner!
Here's a much easier option for you until next Spring.