[m_ram]

Firefox differs from Chrome in that it will enable Flash for a whole page, rather than per-element. This means you still need an extension for blocking Flash ads on Flash video sites.

[rewqfdsa]

Firefox's model is better, I think. Plenty of sites use hidden flash videos for various utility functionality. How are you supposed to click on these hidden videos so that you can enable them?

[magicalist]

You can get the equivalent in Chrome by clicking the puzzle piece in the location bar and selecting "Run all plug-ins this time".

[pwr22]

And that extension doesn't work if javascript isn't enabled for that page :(