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Preview of FireCSS

FireCSS by derivia

Save custom CSS to webpages

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Extension popup for custom css adding.
About this extension
This Firefox extension lets you easily apply custom CSS to any webpage. Simply enter a URL (with wildcard support) and your CSS code, and the extension will inject the styles into the active tab. Perfect for customizing the appearance of websites or testing CSS in real-time.
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Permissions and dataLearn more

Required permissions:

  • Access browser tabs
  • Access your data for all websites
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Version
1.3.3
Size
29.46 KB
Last updated
5 days ago (Aug 24, 2025)
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Release notes for 1.3.3
Hi! This release has a few fixes and enhancements:
  • Remember text box content when closing and reopening the edit panel.
  • Better way of applying CSS while using !important tags.
  • Fixed preview to clean the older version of CSS applied.
  • Checkbox for "recursive" set to marked as default.
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