here is the full info
If you have Google Chrome you need to install this extension. It's only running til the 19th:
Everyone’s total tabs will determine a charitable donation made on behalf of the Chrome community, up to one million dollars. Here's what your tabs can do:
10 tabs = 1 tree planted
10 tabs = 1 book published and donated
25 tabs = 1 vaccination treatment provided
100 tabs = 1 square foot of shelter built
200 tabs = 1 person's clean water for a year
You basically have nothing to do except click for it to add the extension, then every tab it opens will count toward your total. At the end of each day, you choose the charity you want your tabs to count toward.
It doesn't keep a record of your browsing history. It simply counts tabs opened.
So please, please, please, if you have Google Chrome: install this.