Open the Add-ons Manager > Plugins tab. {Ctrl + Shift + A } > Plugins

Then click the More ... hyperlink. Short explanation about each Plugin and either a URL hyperlink or a "Learn more..." hyperlink to take to a webpage for the developer of the Plugin.

Although Plugins that are installed by other programs don't always show any additional information. When that happens it's time to use your favorite search engine to locate that information for your self. All Mozilla can do is to request that Plugin developers provide that information for their users in the Add-ons Manager; and if they don't it's a said commentary about how little they value the users of their applications that install Plugins for Firefox.

See the example screenshots:

Thanks for replying. As I mentioned in my original post, I DID click the "MORE" link and got no information. I've also googled GameTreatWidget and gotten very little info. Especially how to remove it. On theplug-ins page it only shows choices of "always activate" (or never or ask). No way to remove. It doesn't show up in control panel's Programs and Features. It's not found on the app "Should I Remove It?". I found only one app that says it can remove it, but I've never heard of it. ("WindowexeAllkiller Download : Free Download" from http://windowpdb.com/q.php?q=npgametreatwidget-dll-c-program-files-free-ride-games). I learned the hard way about downloading too freely, so I'm leery of downloading this one.

I know I didn't download this. I just wiped my hard drive and reinstalled everything from a jump drive sent to me directly from ASUS. I can't figure out how it got on my PC. Even if I did - how can there be no way to remove it?

Below is the Troubleshooting Report, in case it might help. I couldn't figure out how to copy it from the clipboard, so it's unformatted. Hope it's readable enough. Thanks for your help! Nancie

Troubleshooting Information This page contains technical information that might be useful when you're trying to solve a problem. If you are looking for answers to common questions about Firefox, check out our support website. Application Basics Name Firefox Version 48.0 Build ID 20160726073904 Update History Update Channel release User Agent Mozilla/5.0 (Windows NT 6.3; WOW64; rv:48.0) Gecko/20100101 Firefox/48.0 OS Windows_NT 6.3 x86 Profile Folder Enabled Plugins about:plugins Build Configuration about:buildconfig Memory Use about:memory Registered Service Workers about:serviceworkers Multiprocess Windows 0/1 (Disabled) Safe Mode false Profiles about:profiles Crash Reports for the Last 3 Days Report ID Submitted

Extensions Name Version Enabled ID Adblock Plus 2.7.3 true {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d} BetterPrivacy 1.74 true {d40f5e7b-d2cf-4856-b441-cc613eeffbe3} Classic Toolbar Buttons 1.5.2.2 true CSTBB@NArisT2_Noia4dev ColorfulTabs 30.0.7 true {0545b830-f0aa-4d7e-8820-50a4629a56fe} Duplicate Tabs Closer 2.1.5 true jid0-RvYT2rGWfM8q5yWxIxAHYAeo5Qg@jetpack Emoji Cheatsheet for GitHub, Basecamp etc. 1.2.0 true jid1-Xo5SuA6qc1DFpw@jetpack F.B. Purity - Cleans Up Facebook 9.3.2.1-signed true fbp@fbpurity.com Firefox Guide Study 1 0.1.5 true guide-cfr-1@shield.mozilla.org Firefox Hello Beta 1.4.4 true loop@mozilla.org Flagfox 5.1.13 true {1018e4d6-728f-4b20-ad56-37578a4de76b} LeechBlock 1.0.5 true {a95d8332-e4b4-6e7f-98ac-20b733364387} McAfee WebAdvisor 5.0.226.0 true {4ED1F68A-5463-4931-9384-8FFF5ED91D92} Multi-process staged rollout 1.1 true e10srollout@mozilla.org New Tab Tools 72 true newtabtools@darktrojan.net Pocket 1.0.4 true firefox@getpocket.com RightToClick 2.9.6 true {cd617375-6743-4ee8-bac4-fbf10f35729e} ScrapBook 1.5.13.1-signed.1-signed true {53A03D43-5363-4669-8190-99061B2DEBA5} Show my Password 2.0.1-signed.1-signed true {cd617372-6743-4ee4-bac4-fbf60f35719e} Tabs on Bottom 0.7.3 true tabsonbottom@piro.sakura.ne.jp Thumbnail Zoom 1.4.3.1-signed.1-signed true {E10A6337-382E-4FE6-96DE-936ADC34DD04} Toolbar Buttons 1.1.1-signed.1-signed true {03B08592-E5B4-45ff-A0BE-C1D975458688} Graphics Features Compositing Direct3D 11 Asynchronous Pan/Zoom none WebGL Renderer Google Inc. -- ANGLE (Intel(R) HD Graphics 4000 Direct3D11 vs_5_0 ps_5_0) Hardware H264 Decoding Yes; Using D3D11 API Direct2D true DirectWrite true (6.3.9600.18123) GPU #1 Active Yes Description Intel(R) HD Graphics 4000 Vendor ID 0x8086 Device ID 0x0166 Driver Version 10.18.10.3308 Driver Date 9-16-2013 Drivers igdumdim64 igd10iumd64 igd10iumd64 igdumdim32 igd10iumd32 igd10iumd32 Subsys ID 21021043 RAM Unknown Diagnostics AzureCanvasAccelerated 0 AzureCanvasBackend direct2d 1.1 AzureContentBackend direct2d 1.1 AzureFallbackCanvasBackend cairo Important Modified Preferences Name Value accessibility.typeaheadfind.flashBar 0 browser.cache.disk.capacity 358400 browser.cache.disk.filesystem_reported 1 browser.cache.disk.hashstats_reported 1 browser.cache.disk.smart_size.first_run false browser.cache.disk.smart_size.use_old_max false browser.cache.frecency_experiment 1 browser.download.importedFromSqlite true browser.download.useDownloadDir false browser.places.smartBookmarksVersion 8 browser.search.useDBForOrder true browser.sessionstore.upgradeBackup.latestBuildID 20160726073904 browser.startup.homepage http://tvschedule.zap2it.com/tvlistings/ZCGrid.do?fromTimeInMillis=1471305600000&aid=tvschedule browser.startup.homepage_override.buildID 20160726073904 browser.startup.homepage_override.mstone 48.0 browser.tabs.drawInTitlebar false browser.urlbar.daysBeforeHidingSuggestionsPrompt 0 browser.urlbar.lastSuggestionsPromptDate 20160815 dom.apps.reset-permissions true dom.disable_open_during_load false dom.push.userAgentID 3cf6817cafa2410e9f6988906ebb4718 extensions.lastAppVersion 48.0 gfx.crash-guard.d3d11layers.appVersion 48.0 gfx.crash-guard.d3d11layers.deviceID 0x0166 gfx.crash-guard.d3d11layers.driverVersion 10.18.10.3308 gfx.crash-guard.d3d11layers.feature-d2d true gfx.crash-guard.d3d11layers.feature-d3d11 true gfx.crash-guard.status. 2 gfx.crash-guard.status.d3d11layers 2 media.benchmark.vp9.fps 160 media.benchmark.vp9.versioncheck 1 media.gmp-eme-adobe.abi x86-msvc-x64 media.gmp-eme-adobe.lastUpdate 1471040869 media.gmp-eme-adobe.version 17 media.gmp-gmpopenh264.abi x86-msvc-x64 media.gmp-gmpopenh264.lastUpdate 1471505806 media.gmp-gmpopenh264.version 1.6 media.gmp-manager.buildID 20160726073904 media.gmp-manager.lastCheck 1471640073 media.gmp-widevinecdm.abi x86-msvc-x64 media.gmp-widevinecdm.lastUpdate 1471040897 media.gmp-widevinecdm.version 1.4.8.866 media.gmp.storage.version.observed 1 media.hardware-video-decoding.failed false network.cookie.prefsMigrated true network.predictor.cleaned-up true places.database.lastMaintenance 1471167966 places.history.expiration.transient_current_max_pages 104378 plugin.disable_full_page_plugin_for_types application/pdf plugin.importedState true services.sync.declinedEngines services.sync.engine.prefs.modified false services.sync.lastPing 1471643703 services.sync.lastSync Fri Aug 19 2016 23:21:38 GMT-0500 (Central Standard Time) services.sync.numClients 1 storage.vacuum.last.index 1 storage.vacuum.last.places.sqlite 1471167966 ui.osk.debug.keyboardDisplayReason IKPOS: Touch screen not found. Important Locked Preferences Name Value JavaScript Incremental GC true Accessibility Activated false Prevent Accessibility 0 Library Versions Expected minimum version Version in use NSPR 4.12 4.12 NSS 3.24 Basic ECC 3.24 Basic ECC NSSSMIME 3.24 Basic ECC 3.24 Basic ECC NSSSSL 3.24 Basic ECC 3.24 Basic ECC NSSUTIL 3.24 3.24 Experimental Features Name ID Description Active End Date Homepage Branch

Plugins generally do not have a Remove button because they are installed in a shared location rather than in your currently active profile folder.

To discover the location on disk of plugins, you can use an internal page: type or paste about:plugins in the address bar and press Enter/Return. Each plugin should list the full path and a table of types of content that it handles. Sometimes that will help you associate it with a particular application. Or sometimes things just show up from a free software install, bundled items that were not disclosed plainly or didn't offer an option to reject.