How do I install Adblock for SeaMonkey?
To install Adblock, an extension that allows you to block pop-up ads and website banners, visit Mozilla’s Adblock download site, and click on the Dev.Builds link. Scroll down to the bottom of the page and click the Adblock 0.5 d3 nightly 42link, and confirm by clicking Install in the window that opens. Another window will open reporting that the extension failed to install–this is normal.