Force Google Chrome use single process
If you're running low on memory, you may try to use Safari instead, it allows you to enable single process mode.

For that you need to enable the Debug menu in Safari.


Open Terminal and type in the following command and hit return

defaults write com.apple.Safari IncludeInternalDebugMenu 1

Open the Safari app. (If you had Safari opened, you need to quit and open it again.)

You will see a Debug menu, just check the Disable Per-Tab Web Processes item.


It will ask to quit Safari, click the button and open Safari again.
(It will close all tabs, so make sure you don't have anything pending)
  
Open the Safari app again. You're in single process mode!
You can check it by opening Activity Monitor app.




Results

This is not very scientific, but just to give you some idea.


Before (multi-process)


  50 Tabs opened on apple.com
  Total system ram used 5.61GB  
  
  

After (single-process)


  50 Tabs opened on apple.com
  Total system ram used 4.47GB  
  
  


Reduction in 1.14GB


Reverting


Just uncheck the Debug &gt; Disable Per-Tab Web Processes to go back to the multi process mode.