Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

In addition, several users are complaining that, while upgrading through express setting, Windows 10 changes the default browser to its own Edge instead of Google Chrome or Mozilla Firefox that you may have been using as default for surfing the Internet.

Answer: owner_of: Mozilla, Firefox; product_or_material_produced: Mozilla, Firefox