iFrame - Link Viewer

Preview any link in a pop-up frame without leaving current page (instead of opening a new tab), eliminating the need to go back and forth to navigate to other links.

6 Alternatives To iFrame - Link Viewer

ImagePreviewer

This extension shows a popup with an image preview when hovering over link that points to an image file or a page with an image.
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Imagus

The extension is intended to complement image features that (I think) is missing from Opera by…

Mailvelope

Mailvelope open source project. OpenPGP in your browser.

Plus

Quickly design and document your API

Shaarli

Shaarli is a minimalist link sharing software you can install on your own website

ezLinkPreview

Browse more efficiently: Preview links and images without leaving your current tab.