As mozilla is open source .so,if i will download someone else addons and then edit it by putting some new thing. Is this will be legal?

I have downloaded a addon now I will edit it and put some new thing .
so, can i do this thing.
is it legal?

Developers associate their addons with a certain type of license, which you can view by going to the addon's page at addons.mozilla.org, and expanding the "Version Information" section at the very bottom of the page.
A huge percentage of Firefox addons are released under an open source license.

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  • Firefox crashes when I open my facebook account. But when someone else opens his/her account on my laptop, then the crash never happens..

    <blockquote>Locking duplicate thread.<br>
    Please continue here:
    [[/questions/957008]]</blockquote>
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