Knowing the dimensions of an image can be of great use to many people and especially web-masters. All the details about a particular image can be found out easily by installing the Image Spider add-on. This extension is especially intended for web-masters as shows the image attributes in detail.
You just have to install the add-on. After you’ve installed it, the Image Spider icon should be present on the top right corner.
Click on the Image Spider icon appearing on the right hand side of your Firefox browser and place your cursor on any image.
You will get all the details include image source, width, height and even title and alternate text.!
I installed this add-on and saw all the details about The Windows’ Club’s header image :
Head over to this page if you’d like to install this add-on!