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OpenWeatherMap

Current weather and forecasts in your city

Not yet rated
72 users

OpenWishes Birthday Reminder Requires Restart

With this "Birthday Reminder" add-on you will get reminded for the next upcoming birthdays directly in the browser statusbar.

Rated 4 out of 5 stars (8)
42 users

OpenWith Requires Restart

Are you tired of over and over again looking for all the html/php/js-files you are working on in your web application? Then this add-on can help you and save loads of time by launching the files in your editor for you. Just select and launch...

Rated 1 out of 5 stars (2)
1 user

OpenWLANMap GeoLocation Requires Restart

Configures Firefox to use the free OpenWLANMap project for geolocation; all your data that are required for geolocation are sent to this free project instead to a (commercial) 3rd party afterwards

Not yet rated
56 users

Opera (style) speed dial Compatible with Firefox 57+

Attempting to replicate the ease of use and cleanliness of the Opera Speed Dial

Rated 5 out of 5 stars (1)
49 users

Operator Requires Restart

Operator leverages microformats and other semantic data that are already available on many web pages to provide new ways to interact with web services.

Rated 3 out of 5 stars (37)
756 users

OperaView Requires Restart

Open pages in Opera from Firefox context menus. Very usefull for web developers!

Rated 4 out of 5 stars (31)
532 users

Ophthalmologylive Screen

This enables screen-sharing in the Firefox browser for users of the Ophthalmologylive demo application.

Not yet rated
0 users

OPIE (Ordered Preference Import/Export) Requires Restart

Import/Export your Firefox extension preferences

Rated 4 out of 5 stars (51)
4,071 users

OPIE2 Requires Restart

Advanced Import/Export extension preferences

Rated 5 out of 5 stars (2)
110 users

OpinionCloud (for YouTube & Flickr) Requires Restart

The OpinionCloud summarizes comments on YouTube videos and Flickr photos in order to get an overview about the crowd's overall opinion.

Rated 4 out of 5 stars (11)
0 users

Oplao Weather

Easy to use. Accurate. National And Global Weather Forecast. Firefox status bar icon. Extension contains current weather, detailed forecast, 7 day forecast, fast locations buttons. Oplao.com firefox official weather extension.

Rated 4 out of 5 stars (17)
734 users

OPML Reader Requires Restart

Open a Feed Reader for any OPML Autodiscovery enabled page. You can choose between Optimal OPML browser and...

Rated 5 out of 5 stars (2)
0 users

OPML Support Requires Restart

OPML Support adds OPML import/export functionality to the Firefox Bookmarks manager.

Rated 4 out of 5 stars (21)
1,533 users

Optimizely Toggle

This extension disables Optimizely for the tab you are browsing, via a switch.

Not yet rated
21 users

Optimoz Tweaks Requires Restart

Automatically shows the sidebar when the mouse cursor touches the left window border, and closes it when the cursor is over the web page...

Rated 5 out of 5 stars (1)
2 users

Optimy Search

Google Search redesigned for your sidebar. Search and results always within easy reach.

Rated 5 out of 5 stars (6)
19 users

Options Dialog Restorer (ODR) Requires Restart

Ports the classic Options dialog to Firefox 42 and later.

Rated 3 out of 5 stars (1)
30 users

Options Menu Requires Restart

Quick access to extension options dialogs

Rated 4 out of 5 stars (34)
10 users

Options Toolbar Button Requires Restart

This is a small devision of Michael Buckley's Toolbar Buttons extension. https://addons.mozilla.org/firefox/2377/ or http://codefisher.org/toolbar_button/

Rated 5 out of 5 stars (2)
8 users