adbar displays Google ads related to pages you view. Because the ads are relevant, they are occasionally useful. When adbar isn't displaying ads from Google, it displays Firefox-related things such as silly Firefox slogans, ads for other Mozilla software, and requests for donations to the Mozilla Foundation.
In order to display relevant ads, adbar sends the URLs of pages you visit to Google. More on privacy.
Install adbar 0.3.1. Works in Firefox 0.9 through Firefox 2.
Default configuration: adbar is its own toolbar and shows 2 ads.
You can change the number or position of the ads by right-clicking any toolbar and selecting "Customize".
Google's ad selection is often interesting.
In order to display relevant ads, adbar sends the URLs of pages you visit to Google. Google AdSense then chooses ads to display based on the current URL.
adbar protects your privacy by not sending non-http URLs (e.g. URLs at secure sites) and URLs without dots in the hostname (localhost, some intranet URLs) to Google. adbar also removes query strings from URLs before sending the URLs to Google.
While Google guarantees some privacy for data collected from Opera users, that guarantee doesn't apply to adbar users.
Of course! Paypal $19 (51% cheaper than Opera!) to me or the Mozilla Foundation, then uninstall adbar using the Extension Manager in Firefox's Tools menu.
adbar uses the "test" mode in Google AdSense, so advertisers don't pay Google and Google doesn't pay anyone.
If adbar were to generate revenue from ad clickthroughs, it would violate the AdSense policy that disallows client software from showing the ads. While Google has made an exception for the free version of Opera, it did not respond when I asked for an exception for adbar.
adbar itself is only in English, but it displays ads in the same language as pages you view. For example, if you visit a Klingon page, you'll get ads in Klingon.
adbar is quad-licensed under the MPL, GPL, LGPL, and MIT open-source licenses. Of these, the MIT license is the most liberal.
adbar 0.3.1 (2004-10-12)
adbar 0.3 (2004-10-09)
adbar 0.2 (2004-08-19)
adbar 0.1.5 (2004-08-15)
Slashdot: Not Enough Ads? Install Adbar.
adbar on addons.mozilla.org (includes user comments)