Google-chrome – google chrome – gmail text window gets very wide beyond screen view, very frustrating

Exit Chrome, navigate to your User Data folder (eg C:\Users\IanN\AppData\Local\Google\Chrome\User Data\Default), then open the file Preferences and look for the following section

"browser": {
   .
   . <there will likely be a few sections here>
   .
   "window_placement": {
      "bottom": 1149,
      "left": 0,
      "maximized": false,
      "right": 1600,
      "top": 406,
      "work_area_bottom": 1149,
      "work_area_left": 0,
      "work_area_right": 1600,
      "work_area_top": 0
   },
   .
   .
   .
},…

Either adjust the number, or just delete the whole window_placement block—make sure to be careful not to delete other stuff; use the curly-braces as guides and make sure to match them. (Make a backup copy of the file, just in case.)

Now run Chrome. It should be displayed in the default location. If not, then you could delete the other window_placement_* blocks from Preferences and …\User Data\Local State (Local State is a file in the parent folder of Default.)

Version 41 is the latest development version. You should be running the latest stable version, which is 39.

Update: Latest stable version is now 40.

Source http://en.wikipedia.org/wiki/Google_Chrome#Release_history