To set Firefox to always activate a plugin: Click the menu button, click Add-ons and select Plugins.Find the plugin and click the ellipsis (3-dot) icon, then select Always Activate from the drop-down menu. This will activate the plugin automatically and you will no longer get messages to run the plugin. Download Mozilla Firefox, a free Web browser. Firefox is created by a global non-profit dedicated to putting individuals in control online. In Mac OS X, where are installed extensions for Firefox located? Location of Firefox extensions in Mac OS? closed Ask Question Asked 11 years, 6 months ago. /Library/Internet Plug-Ins Here is a list of files inside this directory. Flash Plugin on Firefox on Mac does not work. Flash Plugin on Firefox on Mac does not work. New Here, Jun 17, 2015. Copy link to clipboard. Why doesn't Flash work on my Mac with Firefox? Whenever I click to 'Activate Adobe Flash' nothing happens. I am really tired of not being able to watch videos. Description is optional, but recommended: it's displayed in the Add-ons Manager. Icons is optional, but recommended: it allows you to specify an icon for the extension, that will be shown in the Add-ons Manager. The most interesting key here is contentscripts, which tells Firefox to load a script into Web pages whose URL matches a specific.

To keep your browsing experience fast, reliable and secure, Firefox will not activate NPAPI plugins such as Adobe Flash by default. Instead, Firefox lets you choose whether or not to allow the plugin to run on a website.
If Firefox blocks a plugin, rather than seeing content, you'll see a message prompting you to click to run the plugin, such as Adobe Flash.
On some sites, you'll see just a blank rectangle, and the plugin notification icon will appear toward the left end of the address bar.
If you click the message or the notification icon to activate the plugin, Firefox will prompt you with these options:
- Allow: Activates the plugin on the website, only for a single visit. To automatically activate the plugin for all future visits to that site, check the Remember this decision checkbox.
- Don't Allow: Dismisses the notification prompt without activating the plugin.
If you click to activate and allow the plugin, the missing content will load normally. (If it doesn't, click the reload button in the toolbar to reload the page and try again.)
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In a situation like this, you can make a smart choice depending on your current task:
- If you're using a trusted site like a special site for your work or school, you might feel safe enough to enable a plugin in order to view the site's content.
- If you don't fully trust a site, for example, you arrived at the site by following a link, you probably do not want to activate the plugin.
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To set Firefox to always activate a plugin:
Click the menu button , click Add-ons and select Plugins. Find the plugin and click the ellipsis (3-dot) icon, then select from the drop-down menu. This will activate the plugin automatically and you will no longer get messages to run the plugin.
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