Shortcut keys for selection search

Add shortcut keys to open a new google result tab for selected text. Shortcut keys can be set in above left menu in Extensions.

Keyboard shortcut keys: 1. Alt+1 -> Open google result of selected text in foreground tab. 2. Alt+Shift+1 -> Open google result of selected text in background tab. *Shortcut keys are editable at chrome://extensions/shortcuts **For Chromebook users** (maybe also Mac OS users) The Alt+1 key will click the first icon in the Shelf, and it will not work on Chrome browser. After the installation, please change the shortcut key from "Alt+1" to another one at chrome://extensions/shortcuts then avoid the built-in shortcut keys on your OS. In the setting page, the right box should be "In Chrome". (Input chrome://extensions/shortcuts in the address bar and press Enter to open a setting page.) *Updates 2024/9/10 v0.400 Update manifest to V3 and minor bugfix. 2022/9/27 v0.201 (=v0.2) 2022/9/20 v0.3 Add feature to search text selected in a single PDF (in chrome's default PDF viewer) 2022/7/10 v0.2 Add feature to search by the default search engine. 2021/6/7 v0.1.0.1 Initial