Those who are in limited bandwidth internet connection may need to preserve bandwidth, so that they do not run out of bandwidth by the end of month. One way to save bandwidth is to block images and flash which eat up lot of bandwidth. You can disable images and flash in options and add-ons sections in firefox but images and flash are important parts of most webpages and you may need a way to easily enable/disable them as and when required. Each time going through options or addons sections and then restarting firefox is not an easy way.
Blocking images using imgLikeOpera
ImgLikeOpera button in firefox provide an easy way to enable/disable images on any web page
imgLikeOpera is an addon which when installed, will easily allow to block or enable images in webpages.
In the settings of this addon, you can set a default policy for images in a new window or new tab. The available options are
Don't load images - No images are loaded, only place markers are shown for each image.
Load cached images only - Load only those images which is already in browser cache.
Load images for the originating Web site only - Load images from the same site only.
Load All images - All images are displayed.
After selecting any of the above option in settings, you can change the setting for any window or tab by the click of one button which is shown in the firefox status bar. if you need to show only one image, you can just load that image only by right clicking the place holder of the image and choosing "Load Image"
Blocked flash contents are displayed as above and can be loaded by clicking on it
Flash contents consume lot of bandwidth and mostly even before you realize that there is flash in the page it may have loaded or started loading.
FlashBlock is an addon which will just replace all flash contents in a page with flash icon buttons. You can press these buttons to load the blocked flash content. This is very useful, as it often happens, when you go to an YouTube page and you are reading the description or comments, even before you decide to view it or not, video has started loading. So this addin helps to load only the required flash contents on demand. Also, there is option to create a list of sites as whitelist, for which flash is not blocked.