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Mozilla Firefox Developer Edition, Portable

development web browser

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Version 63.0 Beta 4 for Windows, English
76MB download / 275MB installed
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Mozilla Firefox Developer Edition, Portable installs easily and works best with the Platform

Also Available: Firefox Stable, Firefox ESR (Extended Support Release), Firefox Beta, Firefox Nightly, Legacy versions


Mozilla Firefox is a fast, full-featured web browser that's easy to use. The Developer Edition adds in debugging and IDE tools as well as a unique theme to the standard beta channel of Firefox.

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App Notes

The developer release will install alongside a standard Firefox Portable install in a FirefoxPortableDeveloper directory. Note that will release one version for each major version (example: 61b1 but not 61b2). For updates within each major release, use the internal updater. From Mozilla: "This is pre-release software: you may encounter compatibility problems with some websites and add-ons."

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Open Source Initiative

Mozilla®, Firefox® and the Firefox logo are registered trademarks of the Mozilla Foundation and are used under license.