When you visit a web site, Mozilla Firefox stores the web pages and embedded content like images etc. on your local hard disk. This local storage is called cache. The cache has a preset size. If cache is full, then the older content is removed to make space for the recently opened web sites. You can change the cache size in Firefox to whatever you like. Here is how :
- Open Mozilla Firefox.
- From the menu bar select, Tools → Options.
- In the Options window, select the Advanced → Network tab.
- Under the category Offline storage, you can specify the cache size as shown,
- Click OK to save the settings
If you specifiy a large cache then the Firefox may become sluggish after some time of usage. If you specify a very small size or zero size, then very small content or nothing will be stored locally and the Firefox will have to download the content again and again — opening the web site slower.