Q: You can right-click on images, text, backgrounds, or any other element. If you don't have a two-button mouse, left-click while holding Control. A toolbar should appear at the bottom of your window. A pane will also appear below the toolbar, displaying the page's HTML code. When you click Inspect Element, several panes will open at the bottom of your window. Here's a breakdown of their uses and names: The top row is the Toolbox Toolbar. This has several developer tools, but we're interested in Inspector on the left. Keep this selected (highlighted in blue) for this entire guide. Below the toolbar, there's a single Breadcrumbs row of HTML elements, showing the full path relating to the selected element. The pane below this row shows the HTML tree or "Markup View" of the page. The HTML for the element you selected is highlighted and centered in this pane. The pane to the right displays the CSS stylesheet for this page. Once the toolbar is open, selecting another element is easy. Here are three ways to do it: Hover over a line of HTML to highlight the corresponding element (requires Firefox 34+). Click the HTML to select that element. Click the Select Element tool on the far left of the toolbar: the icon is a cursor over a square. Move your cursor over the page to highlight elements, then click to select an element. Click anywhere in the HTML pane. Use the left and right arrows on your keyboard to move through the code (requires Firefox 39+). This is useful for elements too small to select by hand. Grey HTML relates to elements not displayed on the page. This includes comments, certain nodes such as <head>, and elements that have been hidden with the CSS display property. Click the arrow to the left of containers to expand or hide its contents. To expand all contents, hold Alt or option while clicking. Look for the search bar (magnifying glass icon) on the far right of the Breadcrumbs row. Click this to expand it, then type in the HTML code you're looking for. As you type, a popup will appear listing matching elements. Click on one to select that element and scroll the HTML pane to its code.
A: Right-click any webpage element. Click Inspect Element from the drop-down menu. Identify the toolbars and panes. Select another element. Navigate through the code. Search for an element.

Q: Cleaning a rare, collectible coin can reduce its value by over 50% due to tiny scratches or the removal of the tarnish. If the gentle cleaning methods above do not work, it's safer to have it cleaned professionally or accept an imperfect appearance. Feel free to use the methods below on common, non-collectible coins if you prefer a brighter appearance for your own collection. An even gold, grey, or iridescent tarnish (toning) is desirable and increases the coin's value. A black or blotchy tarnish is not ideal, but harsh cleaning can still lower the value. Continue very carefully or take it to a professional. After washing the coin in soapy water, you may still see dark areas outlining letters or detailed images. Wash again and pick away this dirt slowly and carefully using a toothpick or bamboo skewer. Take care not to scratch the coin, since the pick can scratch away the tarnish. Pointy plastic utensils are slower, but less likely to scratch the coin. Silver polishes clean metal using acid and abrasives, both of which eat away a small layer of metal. This is an easy way to brighten non-collectible coins, but will almost certainly damage the value of collectibles: Put a coin-sized dollop of polish on a soft cloth. Fold the cloth in half to transfer the polish to two sides. Place the coin between the fold of cloth. Rub together briefly. Wipe off the coin on a clean part of the cloth. This cheaper alternative to silver polish also abrades the silver coin, causing scratches that will be visible under a magnifying glass. Minimize damage by using distilled water and mixing in just a little baking soda to make a watery paste. Dip the entire coin the paste, rub between your fingers for a minute, then rinse with water. Repeat two or three times if necessary. Pat dry. A thick buildup on ancient coins is likely "horn silver" (silver chloride). This may be worth removing, especially if it prevents identification. Submerge the coin in a 10% ammonia solution in a tightly sealed container. Remove it after a few minutes, rinse immediately in water, then brush with a soft toothbrush. Repeat as needed. Warning: ammonia liquid and fumes are corrosive. Wear neoprene gloves and work in a ventilated area. Some hard buildups are the result of a different chemical reaction, which may require other treatments. Consult a coin dealer first if the coin might be valuable. The following treatments are especially risky. Without expert supervision, they may remove the tarnish or pit the coin's surface. These are more often used on ancient coins, where heavy buildup may prevent identification or severely lower the value. Relatively modern, machine-made coins should only be treated this way if they have little collector's value and an unattractive tarnish: Soak the coin in a 50/50 mix of distilled water and lemon juice for one hour. Soak the coin in 1 tsp (5 mL) lemon juice mixed into 1.5 cups (360 mL) olive oil. Warm this in a heat safe container inside a water bath, but keep it below boiling. "Dipping" treatments can return a coin to a frosty white silver appearance, which some collectors value. However, this is an extremely risky procedure that can cause blemishes to appear. Hiring a professional is strongly recommended, but you can buy a dipping solution to use at home.
A:
Use extreme caution with valuable coins. Pick dirt out of small crevices. Rub with silver polish. Wipe with a paste of baking soda and water. Remove hard deposits with ammonium. Use extra-harsh treatments as a last resort.