diff --git a/doc/Firefox_logo,_2019.svg b/doc/Firefox_logo,_2019.svg
new file mode 100644
index 0000000..b5ab67e
--- /dev/null
+++ b/doc/Firefox_logo,_2019.svg
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+<?xml version="1.0" encoding="UTF-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
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diff --git a/doc/Google_Chrome_icon_(February_2022).svg b/doc/Google_Chrome_icon_(February_2022).svg
new file mode 100644
index 0000000..4ff6ab6
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+++ b/doc/Google_Chrome_icon_(February_2022).svg
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diff --git a/doc/Microsoft_Edge_logo_(2019).svg b/doc/Microsoft_Edge_logo_(2019).svg
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