Just like with Firefox you can use the browser location bar to search google. Normally If you enter more than one word in the Microb location bar you will be taken to the google's first search result ('i feel lucky').

To see the normal results page instead do the following:
- type about:config in the location bar
- type in 'Name' field (case sensitive): keyword.URL
- type in the 'Value' field:
- click 'save preference'
- restart the browser

Thanks!

I was going to look into using extensions because I'd found some add-on for microb that was supposed to give support for extensions, or at least a bunch of extra features, but I can't find the link anymore.