I spend hours and hours exploring the Web. At times all that mousing around makes my right hand hurt. So I try to use keyboard shortcuts at least some of the time. At the very least, using different muscles in the hand relieves some of the strain, and sometimes those shortcuts save time compared to the corresponding mouse commands. \n\nIn September I gave you a handful of tips and tricks to make Chrome easier to use; here's a comprehensive list of Chrome keyboard shortcuts supplied by Google. \n\nHere are 20 must-know tips to ease your aching hands when browsing with IE 7 or 8 and Mozilla Firefox 3 on a PC. Internet Explorer 8 Shortcuts1. Here's one I find quite useful when I'm using my laptop on an airplane without a mouse and need to copy and past from a Web page into another application or search bar. It's called caret browsing, and it has nothing to do with diamonds. Pressing F7 brings up a dialog box asking if you'd like to enable caret browsing. Click yes. You'll then see a movable cursor (the caret) that allows you to select and paste text, using well-known keyboard commands like tab, home, page up, and so on. It also works in Firefox, but not in Chrome. \n\n2.\tNeed to adjust the size of the text? You can increase or decrease the size of the page in 10% increments. To zoom in, press CTRL+PLUS SIGN (+). To zoom out, press CTRL+MINUS SIGN (-). To restore the zoom to 100%, press CTRL+0 (that's zero not the letter O). \n\n3.\tTo search the Web using different engines. Press Ctrl+E to get to the search box, followed by Control + down arrow to scroll the list of engines. \n\n4.\tHere's one that gives you a Chrome-like view of open tabs as thumbnails: Ctrl+ Q. (A friend says that feature originated in Safari; that's yet another example of how competition improves products across the board.) \n\n5.\tOpen a new tab in the foreground: CTRL+T\n\n6.\tSwitch between tabs: CTRL+TAB or CTRL+SHIFT+TAB\n\n7.\tClose current tab (or the current window if tabbed browsing is disabled): CTRL+W\n\n8.\tOpen a new tab in the foreground from the Address bar: ALT+ENTER\n\n9.\tSwitch to a specific tab number: CTRL+n (where n is a number between 1 and 8) \n\n10.\tSwitch to the last tab: CTRL+9\n\n11.\tClose other tabs: CTRL+ALT+F4Firefox Shortcuts1. If your browser is pulling up old pages, you can refresh and override the cache at the same time: Ctrl +Cmd+F5\n2.\tMove the cursor up to the address bar: Alt + D \n3.\tBring the cursor to the search bar: Cntrl + Cmd (or Windows key) +K\n4.\tFind text in a page: simply press \/ and type the search term. It will get you right to it. \n5.\tOpen your home page in a new tab: Alt + home. \n6.\tGo back a page: press the backspace key. \n7.\tClear private data: Press alt+shift+delete (not to be confused with alt+control+delete which will reboot your computer in older versions of Windows) \n8.\tDisplay the active window in a full screen: press F11. Press it again, and you're back to the previous size. \n9.\tMove from link to link, or other actionable item by pressing the tab key. Reverse direction with shift+tab. \n\nIf your memory is no better than mine, chances are you won't remember all of these shortcuts. You might want to drop the tips that you think you'll use into a text or Word file and bring it up in a small window while browsing. \nSan Francisco journalist Bill Snyder writes frequently about business and technology. He welcomes your comments and suggestions. Reach him at firstname.lastname@example.org.\nFollow Bill Snyder on Twitter @BSnyderSF. Follow everything from CIO.com on Twitter @CIOonline.