This tip is especially useful for people who surf the web on older hardware (e.g. 500Mhz PIII with 128MB RAM). For example, while editing a post on LinuxQuestions.org, I noticed extreme lag between my typing and the text appearing on the screen. Then I noticed one of those fancy-pants flash adds was running, wasting so much precious computing power that I could’t type normally.
The problem is that I do need flash to be able to run when I don’t care too much about the responsiveness of my old computer. For example, when I am *not* typing a reply to a linux question, but instead want to watch a funny flash animation.
So what I need is a way to disable flash only on certain sites, instead of disabling it completely. And this is (almost) what the Opera browser allows me to do: in opera, you can opt to disable *all* plug-ins for a specific site. The disadvantage of this is that you throw out the baby with the bath water: all the plugins that *don’t* cause problems are also disabled! But at least you can control this on a per-site basis, which still makes it a very useful feature, and this is how you access it:
First in the menubar, select “Tools” => “Preferences” => “Advanced” => “Content” => “Manage site preferences”
Then type the name of the site you want to disable flash for, and click on “Add”.
Enter the site’s URL, and click on the “Content” tab. There, you *deselect* the tick-box “Enable plug-ins” and click on “OK”.
Close all the dialogue windows and restart Opera.
And that’s all there is to it.
In the comments below, two quicker methods for achieving the same effect are discussed, as well as one alternative method that may be used when disabling the browser plug-ins is not an option (e.g. when the site contains non-flash multimedia that you want to play).