diff --git a/program/README.md b/program/README.md
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 - [Asterisk](src/asterisk.md)
 - [Oh My ZSH!](src/ohmyzsh.md)
+- [Firefox](src/firefox.md)
diff --git a/program/src/firefox.md b/program/src/firefox.md
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+# Firefox
+
+## Файл не загружен. Потенциальная угроза безопасности
+
+В адресной строке `Firefox` ввести:
+
+```sh
+about:config
+```
+
+Согласиться `Принять риск и продолжить`:
+
+![firefox_01](img/firefox_01.png)
+
+В поисковой строке найти:
+
+```sh
+dom.block_download_insecure
+```
+
+и установить значение `false`:
+
+![firefox_02](img/firefox_02.png)
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