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Save Tab Space in Firefox with FaviconizeTab
Without trying to explain what I mean lets show it to you visually.
This is how your firefox browser looks like when more than one tab is open. But what when many tabs (like 10 tabs) are open. The space becomes very cluttered. This is when the extension we are talking about comes into play and your browser will look like this.
The tabs are minimized so that they occupy least space. All you need to do is download and install FaviconizeTab extension for firefox. Once installed go to tools > Add-ons and scroll down the window to select FaviconizeTab. Click on options button and you will see the preferences window where you can set your preferences for various websites.
Once the extension is installed you can also right-click on any tab and choose FaviconizeTab from the menu. The tab will be minimized.
To differentiate between various minimized tabs you can use Favicon Picker which will help you to use custom favicons for various websites.