\section{Method\label{sec:metho}}


\subsection{Research design\label{sec:metho:research_design}}
% Stikkord:
% observational study
% browser-based network measurements
% same searches across search engines
% comparison between search engines, browsers, and network modes

\subsection{Test environment\label{sec:metho:test_environment}}
% Stikkord:
% operating system / controlled environment
% Playwright
% Chromium and Firefox
% normal network and Tor proxy
% clean browser context
% cookies allowed
% same wait condition and timeout

\subsection{Search engines and search queries\label{sec:metho:search_engines}}
% Stikkord:
% Google
% Bing
% DuckDuckGo
% Brave Search
% list of search queries
% same query used across all engines

\subsection{Variables and measurements\label{sec:metho:Variables_measurements}}
% Stikkord:
% requests_total
% unique_domains
% third_party_requests
% request_cookies_total
% response_cookies_total
% query_params_total
% post_requests_total
% tracking_hint_requests
% transferred_kb_approx
% page_load_ms
% HTTP status groups

\subsection{Data collection\label{sec:metho:data_collection}}
% Stikkord:
% HAR files
% one HAR file per search engine/query/browser/network mode
% capture_search_har script
% headed browser
% wait-until load
% timeout 60000 ms
% Tor via SOCKS proxy where applicable

\subsection{Data processing\label{sec:metho:data_processing}}
% Stikkord:
% HAR files converted to CSV
% har_entries.csv: one row per HAR entry/request
% har_summary.csv: one row per HAR file
% Power Query used to combine summary files
% folder names used to identify browser/network mode



\subsection{Limitations of the method\label{sec:metho:limitations}}
% Stikkord:
% HAR shows observable browser-side traffic only
% cannot prove server-side storage
% Playwright may differ from manual browsing
% Tor may change website behaviour
% cookie consent state affects results
% tracking_hint is keyword-based, not proof of tracking