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firefox — A free and open source web browser. More information: <https://wiki.mozilla.org/Firefox/CommandLineO

Submitted by: @import:tldr-pages·Mar 2, 2026·

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firefoxcommandandsourcecliopenfreeweb

Problem

How to use the firefox command: A free and open source web browser. More information: <https://wiki.mozilla.org/Firefox/CommandLineOptions>.

Solution

firefox — A free and open source web browser. More information: <https://wiki.mozilla.org/Firefox/CommandLineOptions>.

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

Code Snippets

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

Context

tldr-pages: common/firefox

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