Opera Software
  1. Toolbars
  2. Menus
  3. Panels
  5. Widgets
  6. Notes
  7. Content Blocking
  8. BitTorrent
  9. Display Modes
  10. Source Viewer
  11. Preferences
  12. Advanced Preferences
  13. Skins
  14. Keyboard Shortcuts
  15. Using the Mouse
  16. E-mail and News
  17. Newsfeeds
  18. Chat
  19. Dialogs
  20. Backing Up Opera


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This page describes some of the different dialog boxes in Opera.

Start-up dialog

If you want to decide which pages to start with every time you start up Opera, enable the start-up dialog in the "General" preferences. Note that the start-up dialog will always be displayed after Opera has been forced to close or otherwise has quit unexpectedly.

Tip: Try starting with no pages if you have problems starting Opera.

Session dialog

When you have multiple tabs or windows open in Opera, you can save their addresses to disk as a "session". This allows you to later load the session file, on startup or in the middle of another session, to get the tabs back.

Delete private data

This dialog helps you to delete information about your browsing activities if you are working on a shared computer, but be sure not to erase useful data inadvertently.

Warning: After deleting private data you may have to re-enter various passwords and set up preferences on Web sites again.

Learn more about maintaining security and privacy on a shared computer


This is the dialog where you can completely alter Opera's look and feel.

Skin One-click transformations of Opera's look and color scheme
Panels Select which to display and where to display them
Toolbars Select which to display and where to display them
Buttons Add and rearrange toolbar elements to suit your needs

Report a site problem

Some Web sites and services may not function exactly as you would expect in Opera. This could be caused by Web site authors tailoring their services for one particular Web browser.

If a site is not displaying or behaving correctly in Opera, let us know by using this dialog while the site in question is your active page. Specify how severe you think the problem is, and add a comment if you think it is called for.

Some information about your computer and browser settings will be sent to Opera to help find the cause of the site problem. Click the "details" button on the dialog to see this information.

If you are convinced you have found a defect related to the browser itself, please report it as a bug.

Download file

The download dialog appears when you download a file.

Click "Open" to open the file with Opera.

Click "Save" to specify where to save the file. After the file has been transferred, open it by double-clicking in the Transfer panel.

Note: Use virus-protection software before executing downloaded files.

Learn more about download preferences.

Delete message

When you delete an e-mail message from an ordinary view, it is not actually deleted, but moved to the Trash view. To get back a deleted message, open the Trash view and click the "Undelete" button.

To delete a message permanently, delete it from the Trash view. To delete all messages in trash, right-click the Mail panel and select "Empty trash".

Certificate warning

Certificates are used to verify that a Web site is secure to use. Most of the time certificates are fully valid and you can proceed safely with your business.

If there is something questionable about a certificate, a warning dialog will be displayed. You may choose to proceed, but full security cannot be guaranteed at this point.

Server certificate expired

Certificates like credit cards have an expiry date, and must be renewed on a regular basis by the people maintaining the site.

Accepting an expired certificate does not necessarily reduce security, however take into consideration which site you are visiting and how long since the certificate expired.

Wrong certificate name

A certificate is issued by an authority for a single site to use, and sites cannot borrow certificates from each other as this invalidates the whole concept of certificates.

Accepting a certificate belonging to another site is not recommended.

Certificate signer not found

Certificates are signed by an authority. For example, the secure version of the University of Oslo Web site is authorized by the Thawte organization.

If the signer of a certificate is not found in your list of authorities, you should not accept the certificate unless you have a confident relation with the Web site.

Some certificates are self-signed, that is, signed by the person or organization running the site, and not an authority. Trusting a self-signed certificate from, for example, your employer can be considered as safe.

If you know that the signer can be trusted, and you want all sites using this signer to be considered as safe, install the certificate to add the signer to your regular list of authorities.

Tip: To see your list of authorities, click in the security preferences.

Learn more about privacy and security in Opera