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When i install Google chrome extensions "Page Speed " it is saying that it can access all the data in my computer and can access all data of websites am visiting.

Is it a threat?

Can this extension or addon can get all data or username and password that i am using.

These type of addons of mozilla or chrome have any type of security threat

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It's usually safe. You shouldn't install extensions from unreliable sources though.

Chrome restricts extensions from using potentially powerful features, unless the extension has explicitly requested the permissions in a file called manifest.json. Many features are grouped, and permissions for a specific function cannot be requested without getting the whole pack of functions (for that group). Hence many extensions need "Access to all browser data" (or something similar).

See here for a full list of permissions.

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  • +1 Key point here is to look at the link @Rob has provided and understand it. Also, here is a more user-friendly (as opposed to dev-friendly) description of permissions.
    – neocotic
    Sep 29, 2011 at 7:53
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Alternatively, you could install the extension (possibly in a VM), navigate to chrome://extensions/, enable "Developer mode". This will enable an "Inspect popup" menu option and allow you to browse the source code. Best of luck.

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