Cannot access websites that use PDF with XFA because I am running Linux
I have to access a government website which makes all government forms electronically available as PDF using XFA so they can be filled in. However I am running Firefox on Linux. When I try to download a form from this site the site checks my browser to see if I have the Adobe PDF plugin installed with a release level that supports XFA. If I do not have such a plugin installed, which I cannot since there is no such plugin for Firefox on Linux, then the web site instead of sending me the PDF document, which I could view with any number of offline PDF viewers which do support XFA, sends me a one-line PDF that demands that I install the Adobe plugin. The government will not remove this check since it is a convenience to the vast majority of their clients who are running Windows. Is there some way I can configure my Firefox browser on Linux so it lies to the web-site and says that I have installed the plugin?
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Perhaps you can find a fake plugin file somewhere; someone else must have needed it at some point in time.
From the settings perspective, there is an auto-generated file which stores information about your plugins. I suspect Firefox will detect and remove fictitious entries. Perhaps if you make the file read only, Firefox won't be able to "correct" it? Whether this will populate the Add-ons page, Plugins section, or fool Firefox into thinking there really is an Acrobat plugin, I could only guess.
If you want to try it, the file is named pluginreg.dat and is in your profile folder.
For comparison, I have this for the Adobe Acrobat plugin in the [PLUGINS] section:
nppdf32.dll|$ C:\Program Files (x86)\Adobe\Acrobat 11.0\Acrobat\browser\nppdf32.dll|$ 11.0.12.18|$ 1435585406000|0|0|0|$ Adobe PDF Plug-In For Firefox and Netscape 11.0.12|$ Adobe Acrobat|$ 7 0|application/pdf|Acrobat Portable Document Format|pdf|$ 1|application/vnd.adobe.pdfxml|Adobe PDF in XML Format|pdfxml|$ 2|application/vnd.adobe.x-mars|Adobe PDF in XML Format|mars|$ 3|application/vnd.fdf|Acrobat Forms Data Format|fdf|$ 4|application/vnd.adobe.xfdf|XML Version of Acrobat Forms Data Format|xfdf|$ 5|application/vnd.adobe.xdp+xml| Acrobat XML Data Package|xdp|$ 6|application/vnd.adobe.xfd+xml|Adobe FormFlow99 Data File|xfd|$