Go to the official Adobe Acrobat Reader download page. Google search "Adobe Acrobat Reader download."

Download and install.

Once Adobe Acrobat Reader is installed, you need to tell Firefox to use it instead of its built-in PDF viewer when you encounter a PDF file.

Menu > Settings > General > Applications >

In the list of content types, look for "Portable Document Format (PDF)." Click on the Action drop-down menu and from the list, select "Use Adobe Acrobat Reader".

More info Change Firefox options, preferences and settings

Hi Michael, you might be reading some older instructions.

Firefox hasn't supported the Acrobat/Adobe Reader plugin for several years now (Why do Java, Silverlight, Adobe Acrobat and other plugins no longer work?). I'm pretty sure no other modern browser supports them either.

Can you provide a link to the page that mentions installing Acrobat/Adobe Reader so we have more context and can suggest how to fill that gap? To prevent a delay caused by the spam link moderation queue, you can insert a break into the URL, for example:

https://www.example . com/folder/page

Oh wait, you said extension. There is an Acrobat extension supplied by Adobe as part of Acrobat Standard/Pro/DC which captures web pages to a PDF. Does Pacer need that? If so, you can help Firefox find it on disk if Firefox didn't discover it from a Windows Registry entry. Here's how:

(1) Verify Location

As an example, the Adobe Acrobat extension on my laptop is located here:

C:\Program Files (x86)\Adobe\Acrobat DC\Acrobat\Browser\WCFirefoxExtn\WebExtn\signed_extn

I think the two bolded parts could vary depending on which product you have and how it was installed. In that folder, you should find a file with a name like "adobe_acrobat-1.0-windows.xpi".

(2) Install From File

Open the Add-ons page using either:

• Ctrl+Shift+a (Mac: Command+Shift+a)
• "3-bar" menu button (or Tools menu) > Add-ons
• type or paste about:addons in the address bar and press Enter/Return

In the left column of the Add-ons page, click Extensions. On the right side, find the "gear" button and click that to open a menu, then click "Install Add-on From File". You'll need to point Firefox to that folder to grab the file.

Alternately, it may work to drag-and-drop the XPI file into a regular tab. (I haven't tested that for several years.)

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