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How to manage HTML5 in-built plugin?

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I want to keep it disabled like Flash player unless I asked to "allow plugin" and second this is it buffers full length video occupying and sometimes wasting bandwidth. How to manage both?

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This is not a cure, but should let the web page load without crashing.

Flash block {web link} Never be annoyed by a Flash animation again! Blocks Flash so it won't get in your way, but if you want to see it, just click on it


Type about:addons<enter> in the address bar to open the Add-ons Manager. Hot key; <Control>(Mac:<Command>) <Shift> A)

On the left side of the page, select Plugins. Make sure the ones you want to use are set to Ask or Allow. You can disable the others.

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I prefer Flash Control. https://addons.mozilla.org/en-US/firefox/addon/flash-control/

It gives you control over which sites are allowed to display the Flash player or the HTML5 player.