The settings in Tools > Preferences > Advanced > Network and Tools > Preferences > Advanced > Cookies determine how Web servers handle and monitor your net activities.
Referrer logging
Some Web sites register the site that referred you to them. This information can be used to control content by delivering documents that have some bearing on the site that you came from. If you prefer not to allow a Web site to know where you were before visiting it, especially if you were on a local, secure, or restricted site, disable this option. Note, however, that some sites depend on referrer logging internally.
Enable automatic redirection
Sometimes a site might redirect your browser to a different URL, often because the site has moved. Leaving this option enabled does not constitute a big security risk, but turn it off if you want complete control of what sites you visit.
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E-mail security and Adding certificates in Opera
What is encryption in Opera?
Multimedia and Scripts > Security in Opera
Downloads and File Types
Security and Privacy in Opera
1. Press F1
Consult Opera's built-in help files using the menu or quite simply pressing F1.
2. Search for information on line
If you have a question about Opera, chances are that other users have asked the same question. Answers to many frequent questions can be found on our Web page, so the fastest and easiest way to get help or information is to search for it on line:
FAQ - Frequently Asked Questions
The most frequently asked questions with answers from our knowledge base. The knowledge base contains answers to most of the questions our customers have. You can find a lot of useful information in the different categories.
Opera documentation
Go here for technical information about Opera, such as standards support (HTML, CSS, JavaScript)
The help file search field searches Opera's knowledge base directly provided you are on line.
3. Communicate with other Opera users
Opera has an active user community, and there are a lot of friendly people who exchange ideas and help each other. As part of Opera's user community, your voice is heard, and you can get help with your problems from knowledgeable people who have been using Opera for a long time:
My Opera Community
Our Web-based forums let you communicate with others through your Web browser.
Newsgroups
This is currently one of the most active user communities. Our newsgroups have a lot of traffic, and people are friendly and helpful. The server name is "news.opera.com". This server is free and open to the public.
Opera mailing lists
Here, you can subscribe to our mailing lists. The "Opera Users' list" allows you to communicate with other Opera users by e-mail.
Chat rooms on OperaNet
Join the Opera chat room or a chat room devoted to Opera discussion in your native language. Read more about chat in Opera to find out how to log on.
Many Opera employees participate in these discussions by reading and posting comments.
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Plug-ins are third party software enabling multimedia in Web pages. A plug-in could give you the ability to play audio samples or view video movies, so plug-ins are often the link between the browser and a separate application. You must download and install plug-in software for each type of plug-in content. If you wish not to display plug-in content in Web pages, this can be disabled.
General plug-in installation instructions
These instructions mainly apply to Opera for Windows.
1. Download the plug-in and start the installation program. If given a choice, install the plug-in for use with Netscape (or of course Opera, if provided), not Internet Explorer
2. Follow the on-screen instructions and complete the installation of the plug-in
3. Copy the plug-in's ".dll" file(s) to Opera's "plugins" directory if necessary
4. Restart Opera to be sure that Opera finds the plug-in
How to view .dll files
• Double-click on the "My Computer" icon on your desktop
• From the menu, select Tools > Folder Options
• Click on the "View" tab and select "Show hidden files and folders" under "Hidden Files and folders"
• Make sure "Hide file extensions for known file types" is not selected
• Click "OK"
Dynamic link library files (.dll) should now be visible on your system.
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More on Opera>>Skins
Tweaking the User Interface
Sopurce-opera.com
Contacts
This panel lists your contacts. This panel is hidden by default and will appear only after you have created at least one e-mail, news, or chat account. Type in the name of the contact in the "Quick find" field, and Opera will start matching your search entry as you type. Click on the name of a contact to to view all your e-mail correspondence with that contact. Right-click on the contact and select "Properties" to view or change details, such as name, e-mail address, chat nickname, home page, notes or even an image of that contact.
History
The History panel lists the Web pages you have visited lately. Forgot the URL to that page you saw yesterday? Just go here and look or search for it; the "Quick find" feature makes searches highly efficient. Click on any of the pages in the history to go to them. You can change how many pages (if any) you want Opera to remember, by going to . If you want to delete addresses from the History list, just select them and press Delete.
Note that you can access the full History window, which has times and dates for the pages as well, by pressing Ctrl+Alt+H or by going to .
Transfers
When you download a file, it will appear in the Transfers panel. You can select the file you are downloading there, and choose to stop, resume or retransfer the download. At the bottom part of the panel, you can see information about the download speed, size of the file, and where you are downloading from.
To access the full Transfers page, press Ctrl+Alt+T or go to .
Links
The Links panel displays all the links in your current page. To go to any of the links in that page, click on the links in the panel (or of course click on the link in the page itself). Use the "Quick find" feature to quickly locate particular links or linked file types from the document. If you click on the "Lock" button, the Links panel will keep the links currently in the panel even if you go to another page. Click "Lock" again to change this.
To access the links listing as a page, press Ctrl+Alt+L or go to .
More on Opera Panel>>Opera's Panels
To begin, you will need to set up a new account or import account settings from another application. Go to . If you have not yet created any accounts, you will be prompted to create an account now. If you have already created an account, click the Add button. Select which kind of account you would like to create.
Ask your ISP for the specific server names or IP addresses to enter into the incoming and outgoing mail servers. If your ISP uses a non-standard server port (default ports are 143 for IMAP, 110 for POP, and 119 for NNTP), you can enter it after the server name in the form "servername:port", i.e. "pop.example.com:111".
The "Leave messages on server" setting is enabled by default for POP users. This setting tells Opera Mail to leave all received e-mail on the mail server, so it's accessible from other computers. Most POP users will want this setting disabled if they'll only be accessing their e-mail via Opera Mail.
Once you have created an e-mail or newsgroup account, the menu and panel should appear. You can use these to access your accounts.
Security
TLS and SSL (the precursor to TLS) enable encrypted communications between a mail client and server. Encrypted communications allow your password and other sensitive data to be sent across the Internet without others being able to spy on it. Opera Mail supports both TLS and SSL. The server must support e-mail encryption for you to use this feature.
If you want to use TLS encryption, enable the "Secure connection" setting. If you want to use SSL encryption, enable the "Secure connection" setting and add the necessary port (port 993 for secure IMAP and port 995 for secure POP) in the "Incoming server" input as described above. These settings can also be adjusted on the "Servers" tab in account settings once your account has been created.
Source- opera.com