Firefox includes a built-in PDF viewer to display PDF files inside the browser window. This article explains how to use the built-in PDF viewer, how to fix the common issues you might encounter, and how to use another PDF viewer.

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Table of Contents

• 1Firefox’s built-in PDF Viewer

Firefox includes a built-in PDF viewer that allows you to view almost all PDF files found on the web without an external application (exceptions to this are PDF files with a MIME type incorrectly set). This built-in PDF viewer is enabled by default. When you click on a link to a PDF file or open it from the Firefox Downloads panel, it will be rendered with the built-in pdf viewer.

Fill out forms in PDF Viewer

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Some PDFs files have interactive fields to fill in data (such as on forms). Using Firefox's built-in PDF viewer you can fill out fields such as text, check boxes and radio buttons. After entering data into these fields you can download the file to have the filled out version saved to your computer.

PDF Viewer toolbar functions

• View document thumbnails or outline: The slider button on the far left will open a sidebar with thumbnails of the document's pages. Some documents will also have an outline view available. These make it easy to navigate through a long document.

• Page up and down or skip directly to a page: You can use the up and down arrows to page through a document or enter the number of the page you want to go to.

• Change the size of the document: Use the + and - buttons to zoom in and out or choose a zoom setting from the dropdown menu.

• Fullscreen or Presentation mode: Click the fullscreen button to allow the PDF file to take over your entire screen. Press ESC to exit fullscreen mode.

• Print: Click the Printer button to open the print setup dialog.

• Download: Click the Download button to save the PDF file to your computer or to open it with a PDF reader program.

• Copy current view:Right-clickHold down the control key while you click the current view button to open the current view in another tab or window.

PDF Viewer keyboard shortcuts

Troubleshoot problems with the PDF viewer

• With certain types of PDF files, the PDF Viewer may have problems displaying fonts, colors or the whole document. If some PDF files don't render well or are blank, click the download button on the right side of the document header to open it with the default PDF viewer application on your computer.

• If you can't open any PDF files with the built-in PDF viewer, a Firefox extension could be the cause. You can disable all of your extensions, to see if one of them was the problem. For details, see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.

You can also use a different third party PDF viewer instead of Firefox’s built-in PDF viewer. To change from using the built-in PDF viewer to another PDF viewer:

1. In the Menu bar at the top of the screen, click Firefox and select Preferences.Click the menu button and select ...
2. In the General panel, go down to the Applications section.
3. Find Portable Document Format (PDF) in the list and click on the entry to select it.
4. Click on the arrow under the Action column for the above entry and select the PDF viewer you wish to use from the drop-down menu.

If you want Firefox to always ask you what to do with PDF files, follow the above steps to change the action for the Portable Document Format (PDF) entry, except select Always ask from the drop-down menu. The next time you click on a link to download a PDF file, Firefox will show you a prompt asking what to do with the file. You can then choose to open it with Firefox's built-in PDF viewer, open it with a different PDF application, or you can choose to save the file.

For more information, see Change what Firefox does when you click on or download a file.

You can choose to have Firefox’s built-in PDF viewer as the default for viewing PDFs in the browser but open downloaded PDF files with a third party tool. To open a PDF file you downloaded in Firefox, using a third party viewer:

1. Open the Downloads panel by clicking the download icon next to the address bar.
2. Right-click on the file folder icon of the PDF file and select Open Containing Folder.Hold down the control key while you click (two finger click) the magnifying glass icon of the PDF file and select Show in Finder.
3. Then in the Downloads folder, right-clickControl-click on the file and select Open with and choose your favorite PDF viewer.

Version 7.2

• Windows: amazingslider-win.zip
• Mac (NOT compatible with macOS Big Sur): amazingslider-mac.dmg

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What's New

VERSION 7.2

- Fix a bug in Options dialog

VERSION 7.1

- Fix a bug with slider action buttons

VERSION 7.0

- Add 4 bullet images

VERSION 6.9

- Fix a bug of text watermark

VERSION 6.8

- Add a new transition effect: CSS Slide. The effect uses CSS to animate the slideshow.

VERSION 6.7

- All alt attributes to dynamically created img tags

VERSION 6.6

- Fix the bug when there are unicode characters in the image filename and the published folder name

VERSION 6.5

- Fix the bug when there are unicode characters in the button text

VERSION 6.4

- Add a new skin 'Media Gallery'
- Support advanced options

VERSION 6.3

- Play MP4 videos with HTML5 on Firefox

VERSION 6.2

- Support iframe video

VERSION 6.1

- Add an option to use Flash as default player
- Add options to force using Flash on Internet Explorer 10 and 11

VERSION 6.0

- Support specifying different thumbnail size for small screen devices
- Fix the bug of autoplay after lightbox closed
- Fix the bug of lightbox options not saved
- Fix the bug in bullets navigation

VERSION 5.9

- Fix the bug of ribbon position not saved
- Fix the bug when the watermark link is empty
- Remember the image folder on Windows platform so it will go the same folder when you re-launch the application and add images

VERSION 5.8

- Fix the bug of titles not displaying

VERSION 5.7

- Highlight the current skin when opening the Skins dialog

VERSION 5.6

- Fix the bug of the option 'Apply transition effect to first slide'
- Add 9 transition effects: Tiles, Flip, Flip with Zoom, Ken Burns, 3D with Zoom, 3D Horizontal with Zoom, 3D Flip, 3D Flip with Zoom, 3D Tiles

VERSION 5.5

- Fix the bug of playing MP4 video in lightbox

VERSION 5.4

- Fix the YouTube video issue due to the depreciation of YouTube API v2

VERSION 5.3

Firefox Mac Download

- Fix the bug of fade effect under Firefox
- Support unicode characters in image file names

VERSION 5.1

- Fix a bug when there are multiple sliders on one web page
- Remember the volume of HTML5 video player

VERSION 5.0

- Fix a bug in WordPress plugin

VERSION 4.9

- Fix a bug in WordPress plugin Lightbox popup

VERSION 4.8

- Resume slider autoplay when Lightbox popup is closed

VERSION 4.7

- Fix the bug of text effect settings not saved
- Fix a minor bug in Joomla module

VERSION 4.6

- Add Hungarian language
- Use absolute URL for js files in Drupal module

VERSION 4.4

- Check whether the module name is empty in Joomla module

VERSION 4.3

- Add an option to not display video player control bar
- Support playing video continuously under Firefox

VERSION 4.2

- Add button and button link to slideshow
- Add skins: Content, ContentBox, TopCarousel
- Add text effects: Center text, Center box, Left text

VERSION 4.1

- Add skins: RightThumbs, RightTabs, RightTabsDark, Light, Thumbnails, TextNavigation, SimpleControls
- Add an option to enter custom CSS code

VERSION 4.0

- Add an option: Do not resize images
- Add a transition effect: Elastic
- Add left and right paddings when navigation carousel is on left or right

VERSION 3.9

- Fix minor bugs

VERSION 3.8

- Fix a minor bug in responsive mode

VERSION 3.7

- Fix a bug of playing Vimeo on Android devices

VERSION 3.6

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- Fix the bug of autohiding text showing up on slide switching

VERSION 3.5

- Add an option to create multiple rows thumbnail navigation
- Add two new skins: Mediapage and Multirows
- Enable YouTube to use HTML5 by default
- Fix the bug of text not switching when playing video by clicking thumbnail

VERSION 3.4

- Add an option to not stretch small images
- Add an option to display description in Lightbox popup
- Add an option to display thumbnail navigation in Lightbox popup

VERSION 3.3

- Fix the bug of touch swipe not working in Android

Version 3.2

- Support full width slider
- Support fullscreen slider
- Fix the bug of fade effect with jQuery 1.11.0
- Pause slideshow when lightbox pops up

Version 3.1

- Fix a bug of adding mp4 video

Version 3.0

- Fix a minor bug of Version 2.9

Version 2.9

- Fix the autoplay bug of fade, slide and crossfade effects

Version 2.8

- Add 15 predefined text effects
- Support different text effect for each slide
- Speficy text size for small screen devices
- Specify different autoplay interval for each slide
- Support HTML code in title and description
- Add 4 play video buttons
- Support option textonly in thumbnail

Version 2.7

- Fix the bug of YouTube playing on Android

Version 2.6

- Fix the bug of project not saving on some computers

Version 2.5

- Fix the bug of icons not showing up in application on some computers

Version 2.4

- Save publish options in project file
- Add an option of not showing popup thumbnail on touch screen
- Add an option to choose direction for slide and 3D effects
- Add an option to customise the Lightbox text bar height

Version 2.3

- Fix the bug of random playing

Version 2.2

- Improve the way of random playing
- Fix minor bugs

Version 2.1

- Add an option of adding slider from folder in WordPress plugin

Version 2.0

- Fix a bug of video playing in Opera

Firefox Mac Francais

Version 1.9

- Support mp4 and webm videos
- Support full width slider
- Display play button for video lightbox
- Support API and events

Version 1.8

- Add an option to create standalone WordPress plugin

Version 1.7

- Improve image quality
- Fix a bug in slide transition effect
- Fix a bug when adding Vimeo video
- Add an option: play video when clicking on thumbnail
- Support link in title and description
- WordPress plugin: install from URL
- WordPress plugin: update JavaScript engine files when installing a new plugin file
- Add Polish language file

Version 1.6

- Fix minor bugs

Version 1.5

- Support Vimeo
- Support standalone play/pause button
- Add an option of not croping thumbnail images
- Remember image and project folder
- Add options to specify folders for thumbnail images, lightbox images and skin images
- Support Joomla 1.5
- Add a button to apply web link options to all slides
- Fix a minor bug in lightbox effect
- Improve touch swipe for mobile and tablets

VERSION 1.4

- Add languages: German, Italian, Spanish, Japanese, French
- Export slider to Drupal module
- Support Joomla 3
- 5 new skins: Frongpage, Pink, RedAndBlack, Showcase, WoodBackground
- Add an option of not croping images when resizing
- Add an option to open current large size image and video in lightbox
- Add an option to add required top and bottom margin to slider
- Add an option to enable/disable touch swipe on mobile and tablet devices
- Add an option to customize the vertical position of navigation arrows
- Add an option to show number of slide in title
- Support ESC and ARROW keys in Lightbox
- Web developer can now pass a URL parameter firstslideid to specify the first slide

Version 1.3

- Customize folders of images and JavaScript files when publishing
- Full unicode support
- Display license and project name in main window title
- Support navigation arrows on thumbnail carousel
- Support ribbon image on the slider
- Support vertical thumbnail carousel and navigation bullets
- Support title and description on thumbnail
- 7 new skins: Cube, Events, FeatureList, Highlight, Ribbon, Vertical, VerticalNumber
- Fix minor bugs

Version 1.2

- Fix a minor bug on Internet Explorer 6/7/8

Firefox For Mac Update

Version 1.1

Firefox Mac Full Screen

- Export jQuery Slider as Joomla module
- Fix minor bugs