Any trustworthy free residential proxies to use with proxy foxy extension on firefox ?

I saw a few VPN extensions on Mozilla's addon store but they require full access and is closed source . Foxy proxy seems open source and doesn't seem to be collecting any data for themselves and I'm hopping that combined with https sites only give the proxies which sites im visiting even if they wanted to sell me out CORRECT ME IF I'M WRONG THO . and i don't trust my isp much so it doesn't matter to me if they are selling that only but those vpn extensions will have acess to everything on every site . so yea feel free to correct me on anything and reccomend any .

edit : I don't want recommendations for vpn or any other way like changing dns etc . I just want to change the location on only firefox for android to get past some censorship and geo blocking . if you have any other way to achieve that or better extension than froxy proxy feel free to recommend .

edit : is there anyway to configure proxies on android firefox without using an extension ? i have access to about:config as i use fennec from fdroid .