Web Development

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Modify Headers

Add, modify and filter the HTTP request headers sent to web servers. This addon is particularly useful for Mobile web development, HTTP testing and privacy.

Rated 4 out of 5 stars (71)
343,182 users

iMacros for Firefox Featured

Automate Firefox. Record and replay repetitious work. If you love the Firefox web browser, but are tired of repetitive tasks like visiting the same sites every days, filling out forms, and remembering passwords, then iMacros for Firefox is the soluti...

Rated 4 out of 5 stars (374)
511,481 users

Clear Site Cache No Restart

Quick one click solution to clear the cached contents of the site you are currently browsing.

Rated 5 out of 5 stars (2)
2,394 users

IP Check No Restart

This simple addon will show you the IP address of the site you are currently browsing, with a link to whois.sc for each IP.

Rated 4 out of 5 stars (1)
1,890 users

HTML5 Outliner No Restart

Displays the HTML5 document outline of the current web page. HTML5 Outlines are composed of labels for important structural elements (e.g., heading text, table titles, form titles etc).
Source Code: https://github.com/arky/html5-outliner-addon

Rated 3 out of 5 stars (6)
1,396 users

Auto Refresh

Auto Refresh will refresh or hard refresh any tab or group of tabs at individual or group intervals.

You can also customize your presets and save the ones you most use.

http://www.grizzlyape.com/addons/auto-refresh/

Rated 3 out of 5 stars (35)
39,180 users

Remote XUL Manager No Restart

Manages the Remote XUL whitelist to allow websites and local files to load XUL content.

Rated 5 out of 5 stars (34)
58,032 users

Yandex Wordstat Assistant No Restart

Расширение, позволяющее значительно ускорить сбор слов с помощью сервиса подбора слова Яндекс (wordstat)

Rated 5 out of 5 stars (1)
1,267 users

Pick That Color No Restart

A simple lightweight addon for selecting any color from web pages. It copies the Hex color code of any pixel that is displayed in your browser to clipboard. Just click the color wheel button near your address bar or press 'Ctrl+Shift+z'.

Rated 5 out of 5 stars (2)
1,157 users

Custom User-Agent String No Restart

Set custom User-Agent string. Also available for Firefox on Android.

Rated 3 out of 5 stars (8)
20,627 users

User-Agent Switcher No Restart

Quickly and easily switch between popular user-agent strings.

Rated 4 out of 5 stars (6)
14,738 users

JSON-formatter No Restart

Click addon's icon to quick format JSON document with tabs and new lines.

Not yet rated
2,459 users

Measurer No Restart

Measurer allows to measure dimensions of the objects on html page. Press down shift for multiple measurements.

Rated 4 out of 5 stars (4)
1,277 users

Seamless Print No Restart

Enables silent/unattended/kiosk printing without showing the print dialog.
A simple click turns Seamless Print On or Off.
With Seamless Print turned On, print requests go directly to the printer using any Print options already setup.

Rated 5 out of 5 stars (3)
1,440 users

SeoQuake SEO extension

Seoquake is a Firefox SEO extension aimed primarily at helping web masters who deal with search engine optimization (SEO), social media optimization (SMO) and internet promotion. Seoquake allows to investigate many important SEO parameters.

Rated 4 out of 5 stars (207)
87,260 users

MozRepl

Interactive Javascript Console for Mozilla Applications Developers

Rated 4 out of 5 stars (11)
19,576 users

JQClipboard-bridge

a bridge between the non-priviledge page and the os clipboard

Not yet rated
1,349 users

Access IranianUK in Iran

Bypasses the iranianuk.com filter in Iran.

Rated 5 out of 5 stars (1)
1,926 users

HTTP UserAgent cleaner No Restart

Hinder tracking in internet and allows you to disable unsafe ciphers in https TLS/SSL. Evaluates the strength of the TLS (https) encryption with full log for find weak pages (in version > 0.7.2.1).

Rated 5 out of 5 stars (25)
1,706 users

BrowserStack Local No Restart

UPDATE: This add-on is deprecated and no longer maintained, there is a newer version available at BrowserStack.

Rated 5 out of 5 stars (3)
1,686 users