There’s an interesting hidden feature in Chrome, that allows you to disable by default all the plugins, but allows you to enable the one you want by clicking on it.
To enable the feature, open about:flags on chrome and enable the Click to play feature:
At that point when you open a page that use a plugin you’ll see something like this:
Clicking on the plugin you’ll automatically start the execution of that single plugin:
It surely is annoying to have the FLASH plugin disabled when browsing youtube, so you can setup exception from the Chrome setting page: chrome://settings/content
Click on Manage Exceptions and add the site where you want the plugin to play by default
You can now enjoy a life without flash ads and with a lot less browser crash.