In January, I wrote about some “Opera equivalents to Firefox extensions”:http://virtuelvis.com/archives/2005/01/opera-and-firefox-extensions. This is an updated version, covering many more common Firefox extensions and their equivalent features in Opera.
This document has been translated to a number of languages.
The “SessionSaver”:https://addons.mozilla.org/extensions/moreinfo.php?id=436 extension in Firefox has two built-in equivalents in Opera
# During runtime, Opera keeps a live session of what you do, so that if your browser crashes, Opera will let you restart from where you were.
# If you need to save or restore custom sessions, the File → Sessions menu allows you to both save and restore sessions. You can also, optionally open these custom sessions when you start the browser
h3. Single Window
Firefox has a “Single Window extension”:https://addons.mozilla.org/extensions/moreinfo.php?application=firefox&category=Tabbed%20Browsing&id=50 that prevents pop-ups and similar from spawning in new Windows instead of tabs. This behaviour is built right into Opera by default, and you don’t need to change anything.
Firefox has a “Quicknote”:http://quicknote.mozdev.org/ extension for making notes similar to Post-It(TM). In Opera this is built right in as a web panel available from the panel selector.
If you press select text in Opera, and press Ctrl-Shift-C, your selected text is automatically copied into a note, and the note is linked to the document you pasted it from. If you then double-click your note, Opera will take you to the web page where the note exists.
The “RiteOfTounge”:https://addons.mozilla.org/extensions/moreinfo.php?application=firefox&id=485 extension for Firefox provides a spelling checker for Firefox.
Opera integrates with the “GNU Aspell spelling checker”:http://aspell.sourceforge.net/ (You can also check out the “Windows version of GNU Aspell”:http://aspell.net/win32/. “Read the tutorial”:http://www.opera.com/support/tutorials/opera/spellcheck/ on how to install and use it. The added benefit of Opera’s integration with GNU Aspell is that you also get spell-checking when composing e-mail and Usenet messages.
Opera for MacIntosh integrates with the system-default spelling checker and does not require any installation.
The “NextPlease”:http://nextplease.mozdev.org/ extension for Firefox allows users to assign keyboard shortcuts to jump to next and previous links on search results pages.
Again: This is a built-in feature in Opera, named “FastForward”:http://www.opera.com/features/fforward/. If a page has a link where the text reads “Next”, or similar, the forward mouse-gesture in Opera will take you to the next page of results. It also works with other means of navigating forward in history; keyboard shortcuts and buttons.
The behavior of the fast forward functionality can be customized by editing the fastforward.ini file in the Opera profile folder.
h3. Download Manager Tweak
The “Download Manager Tweak”:http://dmextension.mozdev.org/ extension for Firefox offers a few more options of controlling the Download manager window.
Opera’s Download Manager has all this extension offers by default, and more:
* You can have the Download manager as a panel, as a tab, or you can drag it out of Opera to run it in a separate window.
* You can stop, resume or restart downloads at your own will.
The “linkification”:http://www.beggarchooser.com/firefox/ extension for Firefox makes plain-text URLs clickable.
h3. Gmail Notifier
The Gmail Notifier provides an icon where you are notified about incoming mail in Opera. Opera already has a very good e-mail client named M2 that can be “used with GMail”:http://www.neowin.net/forum/index.php?showtopic=290792&st=60&p=585556935&#entry585556935
In addition, you can subscribe to the “Gmail Atom feed”:https://gmail.google.com/gmail/feed/atom in Opera.
h3. Duplicate tab
The “Duplicate tab”:http://twanno.mozdev.org/duplicatetab.html extension in Firefox allows you to duplicate tabs.
This is, again, a built-in feature of Opera: Right-click a tab and select Duplicate. If you are a keyboard user, you can press Ctrl-Alt-Shift-N to duplicate the current tab.
The “undoclosetab”:https://addons.mozilla.org/extensions/moreinfo.php?id=58 extension in Firefox allows you to undo the closing of the tab.
In Opera, this feature is provided by default: If you accidentally close a tab, press Ctrl-Alt-Z to restore the window. If you are a mouse user, there is a trashcan icon on the Page bar that allows you to reopen a previously closed page. The same Trash can also allows access to previously blocked pop-up windows.
The “Flashblock”:http://flashblock.mozdev.org/ Firefox extension prevents loading of flash movies, and creates a placeholder link for reopening blocked flash content.
* “Hide objects until double click”:http://userjs.org/scripts/general/enhancements/hide-objects works the same way as Flashblock and creates a placeholder link to restore the flash movies
* “Transparent Flash Removal”:http://userjs.org/scripts/general/enhancements/remove-transparent-flash removes certain kinds of Flash movies often used for advertising.
In addition to these options, Opera can turn plug-in support on and off on-the-fly by pressing F12 and unchecking/checking the “Enable plug-ins” option.
*Update:* “Opera 9”:http://www.opera.com/products/desktop/ also offers selective blocking of content. Right-click on a page, and select “Block content”.
* French: Fonctionnalités d’Opera équivalentes aux extensions Firefox II
* Brazilian Portuguese: Funcionalidades do Opera equivalentes às extensões do Firefox – 2a. parte