The computer screen appears brighter in darker environments, for instance when you are working on your computer late at night or in a darkened room. Website with lots of white space or other bright colors are often hard to look at during that time, or at least uncomfortable first until you get used to the glaring light.
Programs like F.Lux have been designed to reduce that effect during the evening and night period, and while they work very well, you may prefer a different solution instead.
Maybe you are working on a company PC and cannot really install desktop software on it, or, you are editing photos at times so that F.Lux cannot be used on the system.
Dimmer is a free add-on for the Firefox web browser that dims all web pages that you visit automatically when it is running.
Take a look at the following screenshot to see what it does.
The extension applies a filter effect to all websites that you visit when it is enabled. It is applied after the website has fully loaded, which means that you may see the regular page for a while before the dimming effect is applied to it.
You can modify the value of the effect in the preferences. It is set to 4 by default which you can set to a value between 0 and 9. A value of 0 turns the feature off for the time being, a value of 9 makes the page so dark that is is not readable anymore.
I suggest you go down with the values first if you think that 4 is too dark as well. A value of 2 or 3 worked best for me during tests.
There is no off switch that you can click on to quickly turn the dimming on or off. For that, you need to open the settings and either disable the add-on for the time being, or set its value to 0. A whitelist or blacklist would be handy to only apply the dimming on select web pages or at least exclude some from it.
What if you are not using Firefox? Then you may be interested in the portable application Dim Screen which dims the whole display and thus all program windows displayed on it.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.