Utilu Mozilla Firefox Collection bundles multiple standalone Firefox versions for web developers who need to compare site rendering across generations of the Gecko engine. The browsers can run at the same time, and local files or URLs can be opened in selected versions with one action. Firebug and Web Developer add-ons support site troubleshooting; window resizing options help check common screen dimensions.

Utilu Mozilla Firefox Collection is a Windows utility for web developers and site testers who need to compare how a website behaves in different Mozilla Firefox releases. It bundles multiple standalone Firefox versions, allowing them to run at the same time rather than requiring users to replace one installation with another. This makes it practical to check pages against different generations of the Gecko rendering engine on a single computer.

The collection can open a local file or web address in selected installed Firefox versions with one action. A developer can enter several filenames or URLs to open them across the chosen browsers, with multiple entries opening in separate tabs. Paths or addresses containing spaces need to be enclosed in quotation marks. This workflow helps compare page layout and behavior without manually launching each browser and navigating to the same pages.

For direct testing from Windows Explorer, the utility can add an option to the file context menu, so a selected page can be opened in chosen Firefox versions. Each browser's version number appears in its window title, making it easier to identify which release is being used during comparison. The included Firebug and Web Developer add-ons provide tools for inspecting and troubleshooting websites, while Web Developer's window-resizing options offer common screen dimensions for checking layouts at different viewport sizes.

The collection is suited to checking compatibility with older Firefox releases, diagnosing browser-specific rendering differences, and validating page designs across a range of resolutions. Running versions side by side makes visual comparisons more direct, while the included developer add-ons support further investigation when a page does not display as expected. It can also be installed for all Windows user accounts, which is useful on shared development computers.

Utilu Mozilla Firefox Collection is freeware. The supplied operating-system compatibility includes Windows 7 and 7 x64, as well as a range of earlier and later Windows releases. Its bundled browsers are standalone, but the collection is intended for testing and comparison rather than as a replacement for a single everyday browser.

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