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If the user chooses browser "add-ons" or "extensions" as their solution, then they can choose open source projects and compile the software themselves after reviewing the source code and modifying it, if necessary, to their satisfaction

"Browser profiles" and other "browser features" created by developers working for Google or Mozilla, a Google partner, that are not reviewed and compiled by the user, are potentially compromised by conflicts of interest if used to protect users from online advertising

If the user does not compile the browser themselves, and permits "automatic updates" (remote code execution), then Google or Mozilla can prevent users from using "extensions" or "add-ons" by changing the browser software

As such, annd for various other reasons not mentioned, using "extensions", "add-ons" and "browser features" as protection from data collection, surveillance and advertising is not ideal

In some cases it may be totally ineffective. In others it may actually subject the user to _more_ data collection, surveillance and advertising