Just IG Image Downloader by ivanusto

Just IG Image & Video Downloader is a simple and easy-to-use Firefox extension that allows you to effortlessly download images and videos from Instagram.
Key Features:

One-click download for both images and videos
Support for various Instagram content types: Regular posts (images and videos), Feed videos
Real-time download status feedback
Clean interface that preserves Instagram's original user experience
Safe and reliable: No personal data is collected

How to use:

Install the extension
Browse Instagram
Hover your mouse over any image or video
Click the download button that appears
Your media will be saved automatically

What's New in Version 2.7:

v2.7 Update Notes:

Click Issue Fixed, resolved a bug where the download button on IG Stories was unclickable due to Instagram's transparent navigation overlay.

UI Layout Optimized, repositioned the download button to the bottom right corner to prevent interference with native mute buttons and the reply bar.

Enhanced Stability, upgraded the underlying injection logic and added dynamic URL observers to ensure the button displays reliably when seamlessly switching between stories.

Support:
For any questions or suggestions, please contact us.
Note: This extension is not affiliated with or endorsed by Instagram.

Chrome Ver. is here:
https://chromewebstore.google.com/detail/just-ig-image-downloader/jkfhcnhffglcmeolblidlogkjmcgpcja

Version History:

2.7 - Resolved a bug where the download button on IG Stories was unclickable due to Instagram's transparent navigation overlay. Repositioned the download button to the bottom right corner to prevent interference with native mute buttons and the reply bar. Upgraded the underlying injection logic and added dynamic URL observers to ensure the button displays reliably when seamlessly switching between stories.
2.6 - Adds full support for Instagram DASH streaming by switching to the official API to fetch muxed MP4 (audio + video). Fixes missing audio/video and incorrect media capture. Supports Stories and carousel posts, with fallback for improved reliability.
2.5 - Download behavior changed, use username and timestamp as filename.
2.4 - Improved Performance. Rewrote video download engine: intercept real CDN MP4 URLs via webRequest instead of relying on blob URLs. Fixed audio-only track filtering (base64url decode fix). Fixed wrong-video downloads on Feed by grouping cached URLs per video with timestamps.
2.3 - Improved video detection and download button placement. Added delayed mounting for videos not yet loaded. Video-first scanning prevents duplicate buttons on the same container.
2.2 - Fix Video or Image download error in some cases. Modify values of minSize and rect.width, rect.height.
2.1 - No more download button on account profile image. Enhanced video URL detection algorithm.
2.0 - Add IG videos download support. IG images download with prefix plus timestamp.
1.0 - Initial release