widevine plugin not installing on firefox - firefox

I'm using Firefox version 89 on mac and I'm not able to play DRM content because the widevine plugin is not installing.
Below is the message displayed in addon
Widevine Content Decryption Module provided by Google Inc. will be installed shortly
steps I have tried to resolve the issue -
Refresh firefox removing all the addons and extensions
Reinstalling and deleting profile under firefox folder
toggling off vpn as mentioned here
please help me to sort the issue and let me know if any other information is needed.

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this is simple screen shot and that's not my website to change css to resolve that
Firefox:
by the way i reinstall firefox and i dont have any problem in google chrome
Chrome:
my problem resolved
after installing 50 version of firefox and enabling hardware accelerator and upgrade that with builtin update manager my problem resolved

Can't install automatically signed unlisted addon

I have developed a Firefox extension that is unlisted because it will only be used internally amongst the family members. After submitting it to addons.mozilla.org, it passed the validation and was signed (status: Preliminary Reviewed). However, when I go to Manage Status and Version page and I click on my addon (.xpi), Firefox tries to install it, but refuses to with the following message:
Firefox has prevented this site from installing unverified addon.
Are there any other necessary steps to take in order to be able to install my newly created addon without messing around in about:config?
Thanks
You have to sign into your addons.mozilla.org account that you uploaded the addon from. Then you download the xpi from the link that got email to you automatically by AMO. You then install (and distribute to your users) that downloaded XPI.

Chrome requiring quicktime, but OS X is saying it's built in. How do I play quicktime movies in chrome?

So in our application, a video preview is displayed after it is uploaded. On my computer, however I'm getting a thumbnail that says 'plugin missing' and upon further inspection it says to install the quicktime plugin.
However, the link provided by Chrome to install the plugin leads to a page on apple's website which says 'quicktime plugins don't need to be installed anymore.'
Some details:
Video Extension: .mov
Codec: H.264, AAC (which may be what is in question here)
Chrome Version: Version 39.0.2171.71 (64-bit)
OSX Mavericks
How do I go about making videos play on my machine, as well as making sure that they show up in the production environment?
Google Chrome has removed support for plugins like Quicktime. Most likely you are also using Chrome 64bit. The Quicktime Plugin was only for 32bit.
HTML5 supports videos out of the box so the browser developers of IE, Firefox and Chrome do not see any more use for such plugins.

Is it possible to migrate Firefox XUL addon users to use a Firefox SDK addon instead?

I've just finished porting a Firefox XUL extension to Firefox SDK, in response to changes coming in a future version of Firefox that would completely break our legacy code. So far, however, I haven't managed to find any guides or documentation for how to migrate users from the older system to the newer one.
Pointing update.rdf to an xpi file generated by the Firefox SDK hasn't produced the desired affect, and simply dragging the xpi into the addon window creates a side-by-side installation.
Any tips on how to gracefully update users to the new architecture?
Looks like this is not only possible, it's very simple: just copy the ID from the install.rdf of the XUL addin and paste it into the ID field of package.json in the SDK addon folder. From reading the docs, I was under the impression the format of the SDK addon ID mattered, looks like I was mistaken.

Firefox 3.6 plugins fail on Mac?

I just upgraded my mac to Firefox 3.6, and now neither of my TIFF Viewing plugins work.
in 3.5, If I had Quicktime on, then I'd get the tiff, viewed through quicktime. If I had Quicktime disabled, but my own plugin, AcellViewTIFF enabled, then I would get ViewTIFF viewing the TIFF. Since I'm the author of ViewTIFF, That's how I had it most of the time.
After I upgraded to 3.6, if ViewTIFF is enabled, I just get a blank space. if ViewTIFF is disabled, no matter whether or not Quicktime is enabled, it goes straight to preview.
Has anyone seen this?
(This is programming related because I'm writing AccelViewTIFF, and if the framework for plugins changed, I need to fix it...)
Edit to add:
This is an NPAPI plugin, I've removed or commented out the main, so I don't think that this is a CFM plugin problem.
I looked at Mozilla's "basicplugin" (located in mozilla-1-9-1-f15a2686e9a6/modules/plugin/sdk/samples/basic/mac under the standard mozilla source) and it works. I compared all of my functions to the functions in BasicPlugin, and the only function that it has that I don't is the drawPlugin function, which appears to do the actual work. All equivalent functions have the same interface.
When I remove or disable AccelViewTIFF, Firefox downloads the image and gives it to preview. When I enabled it it does nothing. This tells me that Firefox IS seeing that I have a plugin, but it's not running it for some reason.
There are no errors either in Firefox's error console or in any of the console logs I can see...
any ideas?
For the record, the problem was that this is an OLD plugin that still uses Quickdraw routines. evidently, they didn't make it into 64b, and so they don't work in FF 3.6.
Lets hear it for progress.
Are you using Leopard or Snow Leopard?
TIFF files open fine with the QuickTime 7.6.3.0 plugin with Firefox 3.6.
Go to Firefox -> Preferences -> Applications. Search for "tif" and then you can choose how Firefox handles files with the image/tiff MIME type. Set it to the plugin of your choosing. QuickTime should work (is for me on Snow Leopard).

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