Favourite Firefox extensions?

What Firefox extensions could you not live without, and why?

[atom42]

I've recently realised how dependent I am on my favourite Firefox extensions, and in light of the fact that Opera are now launching extensions, I thought it might be nice for us to all share our favourite plug-ins that make our days easier. I run an online marketing agency, and we find the following particularly helpful:

SEO Book
Mostly, for the ease in which it allows for a broad (but basic) view of a sites onsite optimisation. The Xray tool is good for seeing what’s a header tag without having to sniff around the code, and you can also set it to show alt tags at a glance, and highlight internal / external links.

Search Status
This is a nice ‘low key’ took that offers quick access to a number of useful bits of information. You can see sitemaps, robots.txt files, IP information, no follow links etc etc.

I find having this information so easily available makes a real difference in how quickly we can make effective recommendations to our clients on their sites. It’s only ever ‘at a glance’ optimisation, but it definitely does a job.

Pearl Crescent
Oh how I missed ZapGrab when I moved to Windows 7. Not for long tho! Pearl Crescent saved my live, and more specifically, saved me from having to use the Snipper tool in windows. It lets you grab a whole page, or just a visible section. Upgrade to the paid one (very cheap) and you can also click to select a region. Assign a keyboard shortcut to that and you’re good to go...

Anyone want to share?

[Demaestro]

Firebug

I use it for so many things... the ruler.... outline tool....cookie management....

Best though are the debug console, the inspect function, the full DOM... I could go on and on.... Life without it is hard.

[alt131]

I use Firefox for testing only - so Firebug. Firebug. Firebug ;)
Best code inspector tool there is.

Also MrTech Toolkit for managing add-ons.

[bhonda]

ColorZilla.

Pick the colour of anything on the current page. Such a time-saver.

[Frank_Rizzo]

Adblock plus - as says on tin

Beef Taco - Permanent opt-out of advertising cookies. Taco used to be good but blew it with bait and switch. Beef Taco created out of that.

Better Privacy - super cookie safeguard

Fasterfox Lite - Probably not need so much now but always had browser optimisation of some kind.

Flashblock - I'll start flash objects when I want to view flash objects.

HTTPS-Everywhere - prevents cookie evesdropping / stealing social networking login credentials in wifi locations. It forces all logins for major sites to default to https.

Noscript - Condom for the web. I'll turn on javascript when I want to turn on javascript. This has to be the #1 add-on if you visit lots of new sites.

OptimizeGoogle - Removes ads and prevents tracking, keeps settings, other stuff.

[enigma1]

I had so many problems with resources never released by firebug that I eventually removed it. Since, I used just some framework specific dom/js alert-based custom script to do my work.

Good extensions for security ordered with importance from my experience:
- Noscript
- RequestPolicy
- Adbblock plus
- CookieSafe
- BetterPrivacy

RequestPolicy is perhaps one of the top security extensions for me, but because of its name, people don't recognize its functionality easily. It blocks resources from external domains when you visit a site pretty much.

A primary way to hijack browsers is by running code from external sites transparently. Very hard to spot and can cause all kinds of problems to webmasters and users. For example say you visit a forum where linking external avatars is allowed. The avatar owner can change what the link brings up at anytime he wants and the forum moderator won't have a clue about it. So with RequestPolicy this can be avoided as it blocks it by default.

I find the above scripts way more efficient than any AV or "o/s security update" anytime because the majority of the intrusions these days are coming from the browser's insecure/stock settings. And at the same time page loading is way faster, you can get to the content you want to read without reading all these ads.

And of course each of these privacy and security extensions have their configuration settings to enable/disable sites you want or setup custom rules when surfing the net.

[Hendrix]

Seoquake plugin to get many seo parameters of the websites.

[koan]

Here are mine:

For a quick lookup of a web page in development on other browsers:

Chrome View
IE view
Opera view
Safari view Win

General web development:

Firebug
Web developer / User agent Switcher

General use:

Flashblock
Screengrab
Google Toolbar

SEO:

Foxy SEO Tool

[lexipixel]

- Chris Pederick's Web Developer Toolbar
- FireBug

[robzilla]

Quirk SearchStatus
Firebug
- Hammerhead
- Page Speed
- YSlow
Dust-Me Selectors
HTML Validator