This has been discussed here before [webmasterworld.com...] but there is a lengthy article in the New York Times about the growing number of lawsuits over this practice. Adobe claims developers are misusing the flash cookies. [nytimes.com...]
Is Adobe trying to kill flash?
When they print stuff like this you wonder if the lawyers understand what they are going into court with.
The suit says that the information collected by the unique ID, using a technology called HTML 5, allowed Web site operators “to track the mobile devices’ Internet activities over multiple Web sites.”
Yes but what FF says after installation or update?
It mentions to don't forget to install or update your flash for the browser to work correctly!
If you can believe it. So I think browser vendors also have responsibility for this. They don't mention the risks to the end user.
btw there are many addons for FF to surf safely, haven't tried flashblock but I use noscript and I can selectively run them. Betterprivacy will clear them on demand or browser exit, but it checks the default flash folders.
And flash is not specific to html5. What they say is correct and is just one of the applications with LSO.