Introduction

Dear Skype,

you are great. You have the convenience of a nearby, well, convenience store and the UI that is acceptable to even an Apple fanboy (I'm not one, I'm just saying).

Skype also has a Firefox extension which finds all pieces of text that resemble phone numbers on web pages you are visiting and converts them into clickable Skype buttons . One click and you're dialing the number. The premise is great but the execution… When it comes to your Firefox extension, Skype – you suck. You really suck.

The Problem Bullshit

So what makes me say these mean things? Is it the fact that when simply searching Google for "skype firefox", one finds mostly blog posts and references to major fail? Or is it the fact that MozillaZine's Problematic Extensions page lists Skype as one of the buggiest?

Well, yes. Those are great, aren't they? However, what really prompted me to write this post is my own experience with this extension.

As I am getting into Android development nowadays, I read the Android dev guide quite a lot. Thus, it was no surprise that yesterday I was happily reading the page about Handling UI Events. What was a surprise, however, is that when I clicked over to the View API reference page (in case that page ever changes for documentation reasons, I also saved it here), my Firefox went into a painful agony and exploded in a few minutes.

What the fudgemonkeys? Let's do this again and watch the Process Explorer. 

This is what we call a memory leak – a prime example at that. In the screenshot above, the CPU usage spikes to 100% (shown as 50% because it's a dual core CPU), Firefox's memory usage jumps to around 2GB from 100MB, in 500MB/s increments. Finally, at 5GB total system memory consumption, either the OS kicks in or some major swapping starts to occur – I'm not sure which of the two is happening exactly but you can see it when the green CPU marker gets overtaken by the red one.

As I have a large number of extensions installed, I was dreading the next step: disabling them until the culprit was found. Ugh…

Sure enough, after about half an hour of starting Firefox, observing the memory leak, killing, and restarting it, I narrowed it down to the Skype extension. Somebody at Skype needs to fess up. And here's the kicker – it only exposes the memory leak in the following configuration:

If you turn number highlighting on – it's fine. If you turn name highlighting off – it's fine. But if you turn number highlighting off but leave name highlighting on – major fail.

The Conclusion

So where am I going with all this? Here is the summary:

• somebody at Skype doesn't know how to program
• this is the worst memory leak in a Firefox extension I've ever seen
• this extension is notorious for its crashes, bugs, and memory leaks
• keep using this extension if you're
  • a masochist
  • need to perform burn-in tests for your CPU or RAM

Have you had problems with the Skype extension? If so, share in the comments.

• Essential Firefox Extensions (Plugins, Add-Ons) And Tips – A Comprehensive Guide :: Part 1 :: Tips
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• Essential Firefox Extensions (Plugins, Add-Ons) – A Comprehensive Guide :: Part 2 :: Pragmatic Extensions

In this article I’m going to discuss a number of useful Firefox extensions and tips. This list is not a “COMPLETE GUIDE TO FIREFOX!!!111!” but a collection of some, albeit many, extensions and techniques I find useful, with detailed descriptions and illustrations. I try to make my reviews as personal as possible and express my own points of view, so I will not be using any boring official descriptions altogether. Short, concise, and useful – that is my goal.

Right now I use 53 extensions in total. If you think that’s a lot, you might be right. However, because Firefox is so mature and new extensions come out every day, it is not as crazy of a number as it was 2 years ago. Firefox gets faster, I download more extensions, and the end result is I’m happier as a user because Firefox suddenly provides me with a lot more features at approximately the same running speed. I plan on continuing to increase this number.

Here’s a quick slightly obsolete screenshot of the extensions I’m using:

Firefox Tips

Before describing extensions, I wanted to mention a few tips about Firefox itself. If you are interested in extensions, proceed to part 2 right away, however I urge you to read these too.

Using the bookmarks bar and shortened names

You can fit a lot of quick bookmarks on the little bookmark bar if you shorten the names to 1 or 2 characters.

Using keywords for bookmarks

A little less known trick is to use the keywords property of your bookmarks. For example, here I assign a keyword ‘d’ to my digg.com bookmark. Then I can just go to the url bar, type in ‘d’, Enter and voila – digg starts loading.

Protecting and locking tabs

Protect a tab will prevent you from closing it.

I use this functionality on my most frequently visited sites – so frequently that I never want to close them. They include the iGoogle homepage, Google calendar, Remember The Milk TODO list, my Trac tickets at work, and a few other things.

These protected states are saved even if you close and open Firefox (but unfortunately, not if you use QuickRestart described in part 2). Protected windows are marked by a symbol.

Locking a tab is similar, but instead of not being able to close it, you are not able to change the url. Any url change attempts will produce a new tab. I personally never use this feature but some may find it handy. Locked windows are marked by a symbol.

Note that you need the Tab Mix Plus extension (described in part 2) for these tricks.

Restoring sessions

While Firefox 3 now has a built-in session restore feature, it’s not very robust. That is why I still use the Tab Mix Plus (described in part 2) session restore feature set. TMP’s session manager remembers protect and lock statuses, tab history, selected tab, and everything else about the session. I will describe TMP in more detail later.

Using keyboard shortcuts

In my experience, keyboard shortcuts are primarily used by power users, while the rest of the population uses a mouse. However, shortcuts are immensely effective time savers and, if you mouse a lot, will provide a relief for your wrist. Let’s take a look at a few easy and important ones.

Ctrl-L and TABs

Ctrl-L will put the focus on the url bar, no matter where you are on the page. It is equivalent to F6 in IE, except it’s actually robust. So, when I’m ready to type in the name of the site, my fingers are already on the keyboard. Ctrl-L doesn’t even require extra movements.

TAB (the key, not the Firefox tab) once after you’ve pressed Ctrl-L and you’re in the Firefox search bar (the one I set to imdb a bit later in the article). TAB twice and you’re in the Google toolbar, if you have it installed.

Ctrl-Enter and Shift-Enter

Ctrl-Enter is a tremendous time saver. It appends “.com” to whatever you have in the url bar and prepends “http://www.”. Type in “google”, press Ctrl-Enter, and voila, you’re at www.google.com. Similarly, Shift-Enter, appends “.net”.

Ctrl-T

Ctrl-T opens a new tab.

Ctrl-Shift-T

Ctrl-Shift-T opens the last closed tab(s), in the order they were closed.

Ctrl-Alt-T

Ctrl-Alt-T duplicates the current tab. Yet again, this is a feature of Tab Mix Plus (described in part 2). Oh how much I love you, TMP.

Ctrl-TAB, Ctrl-Shift-TAB

Ctrl-TAB is probably the most frequently used key combination. It cycles between tabs forward while Ctrl-Shift-TAB does it backwards.

Ctrl-W

Ctrl-W closes the current tab.

Space

Pressing space is a quick way to scroll down one page. It’s a lot of times more convenient than finding the small PgDn button, especially if you have fat fingers.

Setting the Firefox search bar to IMDB

Because I already use the Google Toolbar (one of the most useful toolbars out there) there is little point keeping Firefox’s default search box set to Google. I prefer IMDB (Internet Movie DataBase) myself but you can easily set it to another search engine.

End of Part 1

This marks the end of part 1 in the series. Proceed to part 2.

• Delicious.com [Quietly] Rolls Out Domain And Url Searching/Filtering. Finally!
• Essential Firefox Extensions (Plugins, Add-Ons) – A Comprehensive Guide :: Part 2 :: Pragmatic Extensions
• Firefox Being Slow, Especially Switching Tabs, High CPU Load, Memory Problems? Are You Using Firecookie For Firebug?
• Some Useful vim Commands – My vim Cheatsheet
• Thoughts on Google Chrome