If you don't see any ads, it's most likely that something is blocking them (your browser, extensions, or your network).
If you have an ad blocking extension, you'll have to whitelist the new tab page to ensure we can show you ads on Tab for a Cause (and that you raise money for charity). Please visit and follow the instructions on this page: https://tab.gladly.io/adblockers/
Please note that there are a few adblockers that are not compatible with Tab for a Cause at the moment. Ghostery, Adguard, and Avira do not work on either browser, Adblock Plus is currently not working on Firefox (though should be fixed soon). If you are currently using one of those adblockers, we can highly recommend Ublock Origin as a free, open source, and fast adblocker that works well with Tab for a Cause.
In addition, your browser may be blocking ads from loading if you have enabled any additional privacy options. In this case, you may have to disable the privacy options for the new tab page.
On Firefox, visit your privacy settings (enter about:preferences#privacy into the URL bar) and ensure that the tracking protection is set to "Standard".