My default browser is SeaMonkey and there is no more support for Flash Player
for Linux as per the adobe website:
NOTE: Adobe Flash Player 11.2 will be the last version to target Linux as a supported platform.
Adobe’s Flash Player has come under fire from developers and companies who question its necessity, but the plug-in has just received a big vote of confidence from Google.
This week, Google announced that its Chrome browser will come with Flash built in. And Google, Adobe, and another browser maker, Mozilla, have revealed plans to improve the [...]
As we have witnessed (in the latest months), Adobe Flash Player's fate on Ubuntu (and Linux) is uncertain, uncertain in the sense that the widely used tool/format will not receive major new features, while Adobe will continue to provide security updates to Flash on Linux 11.2 for five years.
“For Flash Player releases after 11.2, the Flash Player browser plugin for Linux will only be available via the “Pepper” API as part of the Google Chrome browser distribution and will no longer be available as a direct download from Adobe.