Clunky, unpretty, but technically works !

Much better than other similar add-ons. The side preview stays open, can be pinned. I've been using it for a while and it worked on any website.

HUGE flaw though : the panel opens on top of the webpage you're browsing. Hiding it totally. Even if you have multiple screens, no matter what : your current browsing session is hidden... behind the panel opened by Simple Link Preview.

So... in a nutshell : great extension. But unusable because it does not forces the webpage to change its aspect to adapt to the fact that the space is now shared with another webpage preview.

Too bad :/ And sadly there's no proper alternative.
Hope the dev will work on that and find a way to improve it.

Please help so I can raise the star rating. I don't know why but sometimes it works instantly, and sometimes it doesn't work at all. Anybody know? I wish instead of clicking on that icon, after a few seconds of hovering it just automatically previewed. I was really hoping it would work on the links in the history menu too. Also wish it would open in a floating window, outside of the firefox window.

"Open in new tab" funktioniert nicht!

az ötlet jó, de egy kis személyre szabás nagyon kellene

第一，反应很慢，鼠标到一个链接上之后要等待一至数秒钟才会弹出插件图标。第二，很多时候插件并不会弹出来，要把鼠标移开并再放到链接上尝试。第三，插件打开后，鼠标在任何的链接上都会立刻预览该链接，这导致预览页面意外变化，另外由于预览页面挡住了右侧，导致原网页右侧的链接也不能使用此方法预览，这样一个设计暂时是无用的。第四，我既然选择了在新标签页打开预览链接，那么预览窗口就应该关闭了，结果它还在。总的来说，这个插件的体验并不好，不如不装。

Very nice, could you try to fix google news links?

Great concept, and this addon does work, but like others have said, it badly needs some customization options, as it hardly has any avail.
Should be able to select desired time frame of when preview opens on all links, or if do not want preview to open. This app opens all over the pages,any time just briefly scroll over links, so you have to keep closing undesired previews, which gets very frustrating to deal with every day, so had to Disable this addon for now. It also does not work on many links still.
Also, should be able to select desired preview window size, and quickly Rt or Lt Click out of preview. Great app, but needs improving, more custom options asap.

It doesn't work with twitter.com. The window of simple link preview is opening but its only a white window!

It's nice to see that Firefox has released a replacement for CoolPreviews. To the Developer; is there a command or set of keystrokes that controls the vertical ↕ size of the preview window? The horizontal ↔ size can be changed with the mouse cursor. The preview window needs to be size adjustable as any other program window. I don't really want a half-screen preview. That defeats the purpose of a link preview that not completely disruptive to the current web page. Evan a default 4x5 inch quarter-panel in the right corner would be better than taking up half or a third of the entire screen with the preview.

Regards,
Arnold Stone

I can't help but compare it with the old CoolPreviews extension that was bought up by Yahoo and then faded away, particularly since this add-on is using the same graphical icon that CoolPreviews did.

It works as it suggests, but the preview window isn't moveable and the pin isn't required because they are ALL pinned by default and only clicking on the X will close the window.

It could stand the user option of choosing where you'd like the graphic to come up when you hover over a link, too.

But it does, otherwise, work fine.

UPDATE May 2020 > +1 star/ -1 star
Even though there is no further development on this extension (because of the "keep it simple" policy), it has survived over many Firefox updates and is still fairly reliable (+1). Unfortunately, when titles are included in hyperlinks (i.e.,
The known workarounds: 1) quickly move the mouse pointer away from the link and hope that the pop-up symbol is still remains on screen just long enough to hover on it or 2) move the mouse away from the link, hover over the link again and hope that the title text pop-up does not completely hide the SLP-pop-up symbol.
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UPDATE Sept. 2018: 4 -> 3 stars
The lack of settings and intermittent quirkiness (see minus-points below) for this great tool is really silly, given how simple it would be (modifying link_preview.css and link_preview.js!)
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Not having a replacement for CoolPreviews ("Preview and share links and media without leaving your current page.") prevented me from updating Firefox since version 45 or so.

This plugin, though still quite rudimentary, provides the essentials not only for viewing links on mouse-over in a popup window (which can be pinned) and still keep the source page in view, but also for working productively (e.g. for web development, for making CMS backend settings) in the popup window.

+ very quick response when mousing-over the preview popup symbol (nice!)
+ minimal essentials (independent forward/backward navigation and scrollbars, keep-open pin, option to open previewed link in new tab)
+ non-obstructive (does not cover other browser elements such as bookmarks, menus, sidebar, scrollbars)

- no popup window resizing or moving (stubbornly covers just over half of the current page) either on-the-fly or in any settings (is there a hack for this?)
- popup symbol sometimes sluggish to appear or does not appear at all on first mouse-over on a link

Looking forward to updating this GREAT, INDISPENSABLE extension to FIVE STARS in the future!

The preview window closes itself and the link opens on a new tab within 2 seconds even though I haven't clicked it. Since no one else mentioned this issue, I wonder if it has anything to do with my Linux system.
EDIT: I just realized that the issue occurs only on Reddit.