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Fix for “Close Firefox: A copy of Firefox is already open.” error

May 16, 2010 - 38 Comments

“Close Firefox – A copy of Firefox is already open. Only one copy of Firefox can be open at a time.” You may have gotten this message if Firefox has recently crashed or you killed the process. The reason this error is appearing is likely because there is a lock file on your Firefox profile. … Read More

Delete Cookies on a Mac

Nov 10, 2009 - 20 Comments

Deleting cookies on the Mac depends on the specific web browser in use, thus if you want to delete all cookies, you’ll want to accomplish this for every browser app. Considering the web browsers most commonly used in Mac OS X are Safari, Chrome, and Firefox, we will show how to delete cookies in each … Read More

Use Firefox to Stop Annoying Web Encounters

Sep 20, 2009 - 1 Comment

MouseOver popups, self-starting blasting audio, auto-refreshing webpages, random sound effects, obnoxious flash ads, resizing of your browser window… oh the web is filled with all sorts of things that are sure to annoy web browsers a world over. Lifehacker came up witha great list of fixes that you can implement in Firefox to reduce the … Read More

View PDF’s inside Firefox with the Firefox-Mac-PDF browser extension

Aug 6, 2009 - 1 Comment

I like Safari but find myself in Firefox nearly always because of a multitude of reasons. One thing I’ve long missed though is the ability to view PDF’s within the browser within Firefox, which Safari does wonderfully. If you’re tired of Firefox launching the Preview app (or even worse if you’re settings are different: Acrobat), … Read More

Run Firefox 3 and Firefox 2 simultaneously

Jun 21, 2008 - 1 Comment

Life is officially easier for front-end web developers, you can now easily test browser compatibility by running Firefox 2 and Firefox 3 concurrently with a great utility called MultiFirefox. Simply install MultiFirefox, then rename one of the Firefox applications (to say, Firefox 3), and upon launch you can select either application version to run. MultiFirefox … Read More

Instant On-Page Text Search in Firefox with This Easy Tip

Dec 16, 2007 - 2 Comments

Here’s a really cool Firefox tip that was just passed along to me that allows you to instantly search on page text. Here’s how this works: You can instantly search for any text on a web page by hitting the forward slash and typing that word. So for example, you want to find “Firefox” on … Read More

Enable Spell Checking in Firefox Text Input Fields

Jun 6, 2007 - 10 Comments

Here’s a great Firefox tip that I think you’ll appreciate as much as I do, which allows for a spell checking function in web based input forms. To accomplish this, you’ll start by editing an entry within the about:config configuration menu of Firefox, where you can enable spell checking in text input fields. For example, … Read More

Learn a Firefox Keyboard Shortcut to Retrieve Closed Tabs

May 24, 2007 - 44 Comments
Firefox logo

Ever closed a browser tab in Firefox and wished you hadn’t done so? A simple keystroke can retrieve that closed browser tab! I can’t count the number of times I have been closing windows or tabs and have accidentally a tab that I wanted kept open. In the past, it has been annoying at best … Read More

15 Must Know Firefox Shortcuts for Mac

May 18, 2007 - 24 Comments
Firefox logo

Firefox is a great web browser for Mac that offers a lot of benefits, and one way to really improve your Firefox experience is to learn and master some keyboard shortcuts for Firefox on Mac OS. Whether you use Firefox as your default Mac web browser, or as just one of a variety of other … Read More

How to disable tab scrolling in Firefox 2

Apr 19, 2007 - 5 Comments

One of my biggest peeves with Firefox 2 is how the tab system works with the scroll bar. Prior to version 2, tabs would squish in size to accommodate more. Being a tab heavy user I found this to be perfectly adequate and I got used to how it works. Enter Firefox 2; instead of … Read More

How to Disable browser window auto-resizing in Firefox

Apr 11, 2007 - 10 Comments

Hate it when a web site resizes your browser window? In Firefox, you can stop that. While development etiquette has generally made web browsing a more pleasant experience over the years, removing such horrors as blinking text and the background midi. Unfortunately, there are a few annoyances still left on web sites, and one of … Read More

Change the Default Web Browser in Mac OS X

Apr 6, 2007 - 30 Comments
Default web browser in Mac OS X

Updated: 11/27/2021 Ever wondered how to change the default web browser app on your Mac? Maybe you prefer Chrome to Safari, or maybe you want to use Firefox instead of Safari, or vice versa? Whatever your choice, it’s easy to do in macOS Monterey, macOS Big Sur, macOS Catalina, macOS Mojave, High Sierra, Sierra, OS … Read More

How to disable automatic image resizing in Firefox

Apr 4, 2007 - 2 Comments

Tim Russell, the man behind the disabling favicon tip for Firefox, sent us another good Firefox tidbit today: “The worst thing about Firefox is undoubtedly that any image larger than your browser size is automatically resized, which has the effect of distorting pictures and generally being annoying. For some reason, Firefox didn’t include the ability … Read More

How to Disable favicon Support in Firefox

Apr 3, 2007 - 7 Comments

Don’t like favicons in Firefox? You can disable the showing of Favicons in Firefox with a settings adjustment. Tim Russell writes in with this tip: “If there’s one thing I hate about websites out there it’s the accompanying favicon’s that litter my browser tabs and bookmarks menu. Surely I’m not the only one that dislikes … Read More

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