Uninstall it and reinstall that Chrome extension. But remember that first you need to have installed the Opera Extension called, "Download Chrome Extension.". That is essential. (I provided the link for that extension in my initial post in this thread). I had TooManyTabs for Chrome on my computer, Opera 22, Windows 7, and it worked fine, so if it doesn't for you, I'm totally puzzled. I also use Windows 7.
If you cannot get it to work, try to download another chrome extension (from the Chrome store. Just pick something else you might like. (As long as you have that Opera Extension, called "Download Chrome Extension" you ought to be able to). At this point, you need to make sure you can get a Chrome extension from the Chrome store. You can always uninstall it!!!! When you go to your extensions, Ctrl Shift E, you can easily uninstall any of them (or just deactivate them).
Remember, after you click on the link in the Chrome store to download it, you still need to go to to your extensions. Ctrl Shift E, should get you to a list of your extensions, and then find it -- they are arranged alphabetically -- and you need to install it.
And don't hesitate to post again. The new Opera 22 is designed is desined to work with extension, so it's a problem if you cannot get a Chrome extension to work with it. It limits what you can do. I'm trying to be certain you're doing this right.