Frequently Asked Questions

January 15, 2006

How do I install this extension?

  • For Mozilla and Firefox, simply click on the install link on the main page and wait for the install dialog to appear. Please be patient waiting for the dialog as it may take up to a minute.
  • For Thunderbird right click the Install link and chose "Save link as" to save the XPI file to your computer. Then open the extension dialog in thunderbird, click the install button and select the xpi file that you just downloaded from the file selection dialog

I get an error message when installing image zoom in mozilla. What do I do to fix it?

There are problems with the install of image zoom 0.2.3+ when upgrading from earlier versions within the mozilla suite. The error message is usually something like "Error Code: -239" or "Chrome Registration Failed". To overcome these issues, follow these steps

  • Install the Extension Uninstaller extension. Don't forget to install the Extension Uninstaller API as well.
  • Restart Mozilla and then choose Tools->Extension Uninstaller from the menu. Select the image zoom item and then follow the instructions to uninstall the extension. You may get errors as i did or have to try it twice.
  • Once uninstalled, restart mozilla and then you are ready to try to install the extension again.

If you have tried this and still can't get it to install, post a question in the forums mentioning that you have already tried this method.

How do I use this extension?

See the image zoom walkthrough.

How does this extension work?

This extension simply modifies the CSS height and width properties of an image within a HTML page and provides the interface to perform these modifications.

Why doesn't it work with background images?

Zooming background images is functionally different from zooming regular images. I have not investigated what is required to do this yet but if you would like this feature, post a request in the forums to express your interest.

This extension slows down Firefox/Mozilla when using page Zoom, why is that?

The Page zooming features zooms all images on a page according to your settings. It does this by changing the style.width and the style.height attributes of each image on the page. This is CPU intensive in the Firefox/Mozilla layout engine if these attributes don't exist. This slows down Firefox/Mozilla considerably when there are many images on a page. From Version 0.2.1, this slowdown does not occur if the page zoom setting is set to the default 100% as no resizing needs to be done.

How do I access the options for this extension?

  • For Firefox and Thunderbird, the options can be accessed through the extensions dialog box. Locate the Image Zoom entry in this dialog and click on the "tick" icon for Firefox, or the Blue icon for Thunderbird, on the right hand side of the dialog.
  • In Mozilla you need to open the preferences from the edit menu and select the "Image Zoom" tab on the left hand side.

I am still having problems, what do I do?

Have a look through the forums and you may find a solution to your problem there already. If not post your problem and I will do my best to provide a prompt response.

I like Image Zoom but I wish it did ...

Post your suggestion or feature in the forums as all requests will be considered.

How do I uninstall Image Zoom?

How to uninstall Image Zoom is the same as uninstalling any other extension and depends on which application you are using

Firefox 0.9+ / Thunderbird 0.7+
  • Open the extensions dialog box by clicking Tools->Extensions from the Menu
  • Select the extension you wish to uninstall and then click the "Uninstall" button
  • Restart the application
Mozilla & all previous version of Firefox / Thunderbird

Since there is no built in way of uninstalling extensions in these applications, I recommend that you use the Extension Uninstaller extension to uninstall extensions from these applications

How can I run firefox in safe mode to disable a roque extension?

In the Program Group the Firefox installer created in your Start menu you will find an item called, "Firefox (Safe Mode)" - if you run into problems, such as the browser not starting, performance being degraded, etc, try running by using this shortcut instead of your usual one, if things improve try uninstalling the last Extension(s) you installed.

If you did not install the Start Menu Program Group, or you're on Linux, start Firefox with the -safe-mode command line switch:

Windows: "C:\Program Files\Mozilla Firefox\firefox.exe" -safe-mode
Linux: ./firefox -safe-mode

Mac OS X users should do the following: cd Firefox.app/Contents/MacOS ./firefox-bin -safe-mode

When run in Safe Mode, Firefox disables all Extensions and reverts to the Default Theme.

Taken from http://www.mozilla.org/projects/firefox/extensions/update.html By Ben Goodger.

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