Question Firefox Browser, preventing ISP and network administrators to know the URLs I visit?

What Version of Firefox?

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I do not know if the settings prevent the ISP from viewing the URLs you visit. Doubtful....

The link you provided lists 15 Firefox configuration settings.

There may be interrelationships that affect each other.

My suggestion is to provide a list of how those 15 settings are configured on your Firefox browser installation.

Then other members can compare their settings and differences can be noted.

E.g. my Firefox has network.ttr.mode set to 0
 
The main scenario where your ISP would not know what websites you are traveling to is if you were using a VPN. The ISP would only see that you were communicating with the proxy server. While it is possible for a browser to have some form of VPN built in, I do not believe Firefox has this capability. There is no magic setting to enable what you want.

Don't do sketchy things and then you do not need to hide your traffic from anyone.
 
Mozilla has a VPN service that integrates, but it is paid


but as always a VPN is not the total picture of how/when your ISP and anyone else on the web can see what you are doing. you can hide a lot but in the end, the web is designed for you to be tracked and it is impossible to be 100% private while using the web.

as noted above, your home IP is like your house address. you can't expect your mail to be delivered, if the mailman does not know where to deliver it. someone, somewhere has to know your address if you expect to receive anything. and that someone is 99.999% likely to attempt to profit from the information they have on you.