said by Kearnstd:id be more worried about the dirt the device retains if you are tinfoil hatting over the issue. a home router does not retain anything close to what your browser does.
That said never fear if you think you missed something, the NSA has its metadata safely stored in Utah.
I agree entirely. I would run updated or third party firmware to minimize DNS redirection exploit vulnerabilities and hacking.
If LE agencies want browsing data they can image your HDD and analyze the contents and in addition will make a request/warrant to your ISP who will provide the info.
You cannot expect any privacy.