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Firefox terms up service (it got way worse)
(www.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
This just means they can use the information you input in order for Firefox to work the way you expect it to. The purpose of the information collection is clearly stated:
But what does that actually mean? It just sounds as vague and non descriptive as possible, which is the worrisome part legally