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diff --git a/data/extensions/jsr@javascriptrestrictor/fp_levels.js b/data/extensions/jsr@javascriptrestrictor/fp_levels.js
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+/** \file
+ * \brief FPD module initial configuration 
+ *
+ *  \author Copyright (C) 2021  Marek Salon
+ *  \author Copyright (C) 2023  Martin Zmitko
+ *
+ *  \license SPDX-License-Identifier: GPL-3.0-or-later
+ */
+//  This program is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+/** \file
+ *
+ * \brief This file is part of Fingerprint Detector (FPD) and contains the function for loading configuration files.
+ *
+ * \ingroup FPD
+ */
+
+//DEF_FPD_FILES_S
+var fp_config_files = ["groups-lvl_0", "groups-lvl_1", "wrappers-lvl_0_1"]
+//DEF_FPD_FILES_E
+
+/**
+ *  Object containing parsed input from JSON configuration files of FPD module.
+ */
+var fp_levels = {};
+
+/// \cond (Exclude this section from the doxygen documentation. If this section is not excluded, it is documented as a separate function.)
+{
+	// parse input files into fp_levels for each level, generate wrapping code and initialize FPD module
+	let loadFpdConfig = async () => {
+		for (let file of fp_config_files) {
+			try {
+				let config = JSON.parse(await readFile(browser.runtime.getURL(`fp_config/${file}.json`)));
+				let file_splitted = file.split("-");
+				let file_levels = file_splitted[1].split("_").filter(x => x != 'lvl');
+				fp_levels[file_splitted[0]] = fp_levels[file_splitted[0]] || {};
+				for (let level of file_levels) {
+					fp_levels[file_splitted[0]][level] = config;
+				}
+			}
+			catch (e) {
+				console.error(e);
+			}
+		}
+
+		// merge duplicit entries of the same resource to be wrapped only once
+		let mergeWrappers = (sameResources) => {
+			let mergeGroups = () => {
+				let accArray = [];
+				for (let resource of sameResources) {
+					accArray.push(...resource.groups);
+				}
+				return accArray;
+			}
+
+			return {
+				resource: sameResources[0].resource,
+				type: sameResources[0].type,
+				groups: mergeGroups()
+			}
+		}
+
+		fp_levels.page_wrappers = [];
+		for (let level in fp_levels.wrappers) {
+			let tmpWrappers = {};
+			for (let wrapper of fp_levels.wrappers[level]) {
+				if (!Object.keys(tmpWrappers).includes(wrapper.resource)) {
+					let sameResources = fp_levels.wrappers[level].filter(x => x.resource == wrapper.resource);
+					tmpWrappers[wrapper.resource] = mergeWrappers(sameResources);
+				}
+			}
+			fp_levels.wrappers[level] = Object.values(tmpWrappers);
+
+			// Save FPD wrappers for page configuration
+			fp_levels.page_wrappers[level] = fp_levels.wrappers[level].map(w => [
+				// Wrapped object name
+				w.resource,
+				// Wrapped object type (0 - function, 1 - property)
+				w.type === "property" ? 1 : 0,
+				// Array specifying property types to wrap (getter, setter or both)
+				Array.from(new Set(w.groups.map(x => x.property != undefined ? x.property : "get"))),
+				// Specify if arguments should be sent for evaulation
+				w.groups.some(group => "arguments" in group) ? 1 : 0,
+			]);
+		}
+
+		// initialize FPD module (background script and event listeners)
+		initFpd();
+
+		fp_levels_initialised = true;
+		if (levels_initialised) { // Wait for both levels_initialised and fp_levels_initialised
+			var orig_levels_updated_callbacks = levels_updated_callbacks;
+			levels_updated_callbacks = [];
+			orig_levels_updated_callbacks.forEach((it) => it());
+		}
+	}
+	loadFpdConfig();
+}
+/// \endcond