Refresh all tabs in Google Chrome

You can select multiple tabs by holding down Ctrl (in OS X: Cmd) and clicking on multiple tabs. If you want to select all of the tabs click on the first tab, hold down shift, then click on the last tab.

Now that you've selected the tabs, right click on any of the tabs and click reload.

There's an extension that does exactly that:

Reload All Tabs

Features:

• Keyboard shortcut to reload tabs is bound to Alt-Shift-R
• Reload all tabs in all windows (enabled via options)
• Option to just reload pinned tabs
• Configurable keyboard shortcut
• Configurable context menu

It also sits in the toolbar so you could just click a button.

Another method without installing extensions: set Chrome to reopen the pages that were open last in Options, then close and reopen the browser. Occasionally I'll do this to refresh all the pages if I accidentally open my browser without an internet connection :-)