Update cheatsheets

firefox

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# firefox
+
+> A free and open source web browser.
+> More information: <https://developer.mozilla.org/en-US/docs/Mozilla/Command_Line_Options>.
+
+- Launch Firefox and open a web page:
+
+`firefox {{https://www.duckduckgo.com}}`
+
+- Open a new window:
+
+`firefox --new-window {{https://www.duckduckgo.com}}`
+
+- Open a private (incognito) window:
+
+`firefox --private-window`
+
+- Search for "wikipedia" using the default search engine:
+
+`firefox --search "{{wikipedia}}"`
+
+- Launch Firefox in safe mode, with all extensions disabled:
+
+`firefox --safe-mode`
+
+- Take a screenshot of a web page in headless mode:
+
+`firefox --headless --screenshot {{path/to/output_file.png}} {{https://example.com/}}`
+
+- Use a specific profile to allow multiple separate instances of Firefox to run at once:
+
+`firefox --profile {{path/to/directory}} {{https://example.com/}}`
+
+- Set Firefox as the default browser:
+
+`firefox --setDefaultBrowser`