Image Replacer 作成者: f3rufus

This extension allows you to replace images on a web page with your own via URL or directly from your device.

HOT IT WORKS

Desktop
Right-click any image → select "🔄 Replace this image" from the context menu → choose a replacement URL or upload a local file → click Apply.

Mobile (Firefox for Android)
Long-press any image (hold for ~0.3s) → the replacement panel slides up from the bottom → choose URL or file → tap Apply.

The replacement is applied immediately and saved. Next time you visit the same page, the image is swapped automatically.