TabFreeze

Automatically freezes unused tabs to free up system resources

“Freeze” Chrome tabs to reduce memory footprint. Tabs can auto-Freeze after a configurable period of time or be suspended manually. Tabs can be whitelisted to avoid automatic freezing. 
Freezed tabs are retained after closing and reopening browser, preventing many tabs from all reloading after a restart. Very simple, intuitive interface. Designed for users that like to have many tabs open at the same time. This extension will automagically unload each tab while retaining its favicon and title text. A tab can be restored by clicking anywhere on the page when it is needed. This reduces the number of dom elements on the page and ensures no memory leaks or excessive javascripts are running.