check this:

• see if there are updates for your graphics drive drivers

https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

• disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later)

https://forums.adobe.com/message/4468493#TemporaryWorkaround

• disable hardware acceleration in the Flash plugin

https://forums.adobe.com/thread/891337 See also:

• http://kb.mozillazine.org/Flash#Troubleshooting

Separate Issue; Your System Details shows;

Installed Plug-ins

Adobe Shockwave for Director Netscape plug-in, version 12.2 Adobe Shockwave for Director Netscape plug-in, version 12.1.1.151
Having more than one version of a program may cause issues. You must remove the older programs. Then get the current full installer.

Shockwave Director: Shockwave Standalone Installer / Uninstaller{web link} Shockwave Director Version 12.2.0.162 http://get.adobe.com/shockwave/

First, thanks FredMcD for your response. Although I did some of the suggested actions (checked video card drivers and clean installed shockwave's last version), then I realized that it's not related with the aforementioned or flash or other plugins. Just out of curiosity, I restarted FF in Safe Mode and it worked! Therefore I assume some of my extensions must be making trouble, and I have too many of them (around 20). Moreover, I realized that it not only does not load the video, it doesn't even load the video (e.g. sports event) title (text) at the right of video window, so something is interfering with the whole ESPN/FOX page, not just the video. If you know of an extension causing this sort of behavior, just let me know (in the same manner if my deduction above is wrong). In case you want to take time and effort, below is a copy of my FF's Troubleshooting Information page. Thanks a lot,

Fernando

Application Basics

Name: Firefox Version: 41.0.2 Build ID: 20151014143721 Update Channel: release User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0 Multiprocess Windows: 0/1 (default: false)

Crash Reports for the Last 3 Days

All Crash Reports (including 1 pending crash in the given time range)

Extensions

Name: Adblock Plus Version: 2.6.11 Enabled: true ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}

Name: Adblock Plus Pop-up Addon Version: 0.9.2.1-signed Enabled: true ID: adblockpopups@jessehakanen.net

Name: Beyond Australis Version: 1.3.1 Enabled: true ID: thefoxonlybetter@quicksaver

Name: CleanPrint Version: 4.8.3 Enabled: true ID: cleanprint@formatdynamics.com

Name: Clearly Version: 10.2.1.7.1-signed Enabled: true ID: readable@evernote.com

Name: Clip to OneNote (Legacy Edition) Version: 4.0.rev658.1-signed Enabled: true ID: jid0-e0l1gzjOmbUL1N6n3j8dBSBMcGE@jetpack

Name: Copy As Plain Text Version: 1.0.9.1-signed Enabled: true ID: {1a5dabbd-0e74-41da-b532-a364bb552cab}

Name: Cuevana Stream Version: 5.0 Enabled: true ID: {a3a5c777-f583-4fef-9380-ab4add1bc2a8}

Name: cyscon Security Shield Version: 1.12.1 Enabled: true ID: cyscon-phishing-protection@patugo.com

Name: Download Manager Tweak Version: 1.0.9.1-signed Enabled: true ID: {F8A55C97-3DB6-4961-A81D-0DE0080E53CB}

Name: Empty Cache Button Version: 2.7.1-signed Enabled: true ID: {4cc4a13b-94a6-7568-370d-5f9de54a9c7f}

Name: Evernote Web Clipper Version: 6.0.15.1-signed Enabled: true ID: {E0B8C461-F8FB-49b4-8373-FE32E9252800}

Name: Facebook Phishing Protector Version: 4.4.3.1-signed Enabled: true ID: {023e9ca0-63f3-47b1-bcb2-9badf9d9ef28}

Name: Facebook™ Disconnect Version: 0.1.1 Enabled: true ID: jid0-dBgF7UkIiOsWqvBng4hYu@jetpack

Name: FEBE Version: 8.7.1-signed Enabled: true ID: {4BBDD651-70CF-4821-84F8-2B918CF89CA3}

Name: FireFTP Version: 2.0.24.1-signed Enabled: true ID: {a7c6cf7f-112c-4500-a7ea-39801a327e5f}

Name: FoxClocks Version: 4.1.4 Enabled: true ID: {d37dc5d0-431d-44e5-8c91-49419370caa1}

Name: Ghostery Version: 5.4.8.1 Enabled: true ID: firefox@ghostery.com

Name: HTTPS-Everywhere Version: 5.1.1 Enabled: true ID: https-everywhere-eff@eff.org

Name: IE Tab 2 (FF 3.6+) Version: 5.12.12.1.1-signed Enabled: true ID: {1BC9BA34-1EED-42ca-A505-6D2F1A935BBB}

Name: Krayon Version: 0.3.1-signed Enabled: true ID: jid1-1269JvYFBgj1Wg@jetpack

Name: MinimizeToTray revived (MinTrayR) Version: 1.1.2.1-signed Enabled: true ID: mintrayr@tn123.ath.cx

Name: Mozilla Archive Format Version: 3.1.1 Enabled: true ID: {7f57cf46-4467-4c2d-adfa-0cba7c507e54}

Name: Open in Chrome™ Version: 0.1.0 Enabled: true ID: jid1-r2yWXsZku2AJH2@jetpack

Name: Pocket Version: 3.0.6.1-signed Enabled: true ID: isreaditlater@ideashower.com

Name: Print Edit Version: 16.3 Enabled: true ID: printedit@DW-dev

Name: Print Friendly & PDF Version: 2.0.2 Enabled: true ID: jid0-YQz0l1jthOIz179ehuitYAOdBEs@jetpack

Name: Private Tab Version: 0.1.8 Enabled: true ID: privateTab@infocatcher

Name: Reload Skip Cache Button Version: 1.1.3 Enabled: true ID: reload-skip-cache-single@codefisher.org

Name: ReminderFox Version: 2.1.5.2.1-signed Enabled: true ID: {ada4b710-8346-4b82-8199-5de2b400a6ae}

Name: Restartless Restart Version: 9.1-signed Enabled: true ID: restartless.restart@erikvold.com

Name: Screengrab (fix version) Version: 0.98.09c Enabled: true ID: {02450914-cdd9-410f-b1da-db004e18c671}

Name: Session Manager Version: 0.8.1.7 Enabled: true ID: {1280606b-2510-4fe0-97ef-9b5a22eafe30}

Name: Show Anchors 2 Version: 1.12.1-signed Enabled: true ID: show-anchors-2@stefanheule.com

Name: Tab Counter Version: 1.9.9.1-signed Enabled: true ID: tabcounter@morac

Name: Tab Mix Plus Version: 0.4.1.9 Enabled: true ID: {dc572301-7619-498c-a57d-39143191b318}

Name: Troubleshooter Version: 1.1a.1-signed Enabled: true ID: troubleshooter@mozilla.org

Name: UnloadTab Version: 0.24.7.1-signed Enabled: true ID: unloadtab@firefox.ext

Name: Video DownloadHelper Version: 5.4.1 Enabled: true ID: {b9db16a4-6edc-47ec-a1f4-b86292ed211d}

Name: ViewMarks Version: 2.0.8.1-signed Enabled: true ID: {7443739c-bff6-4af0-aea5-7ed29006966c}

Name: ZenMate Security, Privacy & Unblock VPN Version: 5.0.3 Enabled: true ID: firefox@zenmate.com

Name: Broadband Speed Test and Diagnostics Version: 1.2.5.1-signed Enabled: false ID: speedtest@gotomyhelp.com

Name: DownThemAll! Version: 2.0.18.1-signed Enabled: false ID: {DDC359D1-844A-42a7-9AA1-88A850A938A8}

Name: Fire IE Version: 0.4.5.2 Enabled: false ID: fireie@fireie.org

Name: ImTranslator Version: 8.20 Enabled: false ID: {9AA46F4F-4DC7-4c06-97AF-5035170634FE}

Name: Logitech SetPoint Version: 6.5 Enabled: false ID: {F003DA68-8256-4b37-A6C4-350FA04494DF}

Name: NoScript Version: 2.6.9.38 Enabled: false ID: {73a6fe31-595d-460b-a920-fcc0f8843232}

Name: PDF Download Version: 3.0.0.2.1-signed Enabled: false ID: {37E4D8EA-8BDA-4831-8EA1-89053939A250}

Graphics

Adapter Description: NVIDIA GeForce 9600M GT Adapter Drivers: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um Adapter RAM: 512 Asynchronous Pan/Zoom: none ClearType Parameters: Gamma: 2200 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 50

Important Modified Preferences

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_cached_value: 358400 browser.cache.disk.smart_size.first_run: false browser.cache.disk.smart_size.use_old_max: false browser.cache.frecency_experiment: 4 browser.download.importedFromSqlite: true browser.download.manager.alertOnEXEOpen: false browser.download.manager.closeWhenDone: false browser.download.manager.showWhenStarting: false browser.history_expire_days.mirror: 180 browser.link.open_newwindow.restriction: 0 browser.places.importBookmarksHTML: false browser.places.smartBookmarksVersion: 7 browser.search.openintab: true browser.search.useDBForOrder: true browser.sessionstore.restore_pinned_tabs_on_demand: true browser.sessionstore.upgradeBackup.latestBuildID: 20151014143721 browser.startup.homepage: about:home browser.startup.homepage_override.buildID: 20151014143721 browser.startup.homepage_override.mstone: 41.0.2 browser.tabs.closeWindowWithLastTab: false browser.tabs.selectOwnerOnClose: false browser.tabs.tabMinWidth: 75 browser.tabs.warnOnClose: false dom.apps.reset-permissions: true dom.ipc.plugins.enabled.npietab2.dll: true dom.max_chrome_script_run_time: 60 dom.max_script_run_time: 0 dom.mozApps.used: true dom.w3c_touch_events.expose: false extensions.lastAppVersion: 41.0.2 font.internaluseonly.changed: true general.useragent.extra.microsoftdotnet: ( .NET CLR 3.5.30729; .NET4.0C) gfx.direct3d.checkDX10: false gfx.direct3d.last_used_feature_level_idx: 1 gfx.driver-init.appVersion: 41.0.2 gfx.driver-init.deviceID: 0x0649 gfx.driver-init.driverVersion: 9.18.13.4181 gfx.driver-init.feature-d2d: true gfx.driver-init.feature-d3d11: true gfx.driver-init.status: 2 media.gmp-eme-adobe.lastUpdate: 1444141460 media.gmp-eme-adobe.version: 13 media.gmp-gmpopenh264.lastUpdate: 1432336386 media.gmp-gmpopenh264.version: 1.4 media.gmp-manager.buildID: 20151014143721 media.gmp-manager.lastCheck: 1445637966 media.hardware-video-decoding.failed: false network.cookie.prefsMigrated: true network.predictor.cleaned-up: true permissions.default.image: 0 places.database.lastMaintenance: 1445695730 places.history.expiration.transient_current_max_pages: 104858 places.history.expiration.transient_optimal_database_size: 167772160 places.last_vacuum: 1301101181 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true plugin.state.np32dsw: 2 plugin.state.npgeplugin: 2 plugin.state.nppdf: 2 print.print_printer: Epson Stylus TX420W(Red) print.print_scaling: 0.70 print.print_shrink_to_fit: false print.printer_Adobe_PDF.print_bgcolor: false print.printer_Adobe_PDF.print_bgimages: false print.printer_Adobe_PDF.print_colorspace: print.printer_Adobe_PDF.print_command: print.printer_Adobe_PDF.print_downloadfonts: false print.printer_Adobe_PDF.print_duplex: 3014712 print.printer_Adobe_PDF.print_edge_bottom: 0 print.printer_Adobe_PDF.print_edge_left: 0 print.printer_Adobe_PDF.print_edge_right: 0 print.printer_Adobe_PDF.print_edge_top: 0 print.printer_Adobe_PDF.print_evenpages: true print.printer_Adobe_PDF.print_footercenter: print.printer_Adobe_PDF.print_footerleft: print.printer_Adobe_PDF.print_footerright: print.printer_Adobe_PDF.print_headercenter: print.printer_Adobe_PDF.print

I have the same problem where flash based videos, twitch, espn, etc, don't play. Nothing crashes but I do get some stuttering and sometimes the page freezes for a little bit when I mouse over the video. Everything works fine on other browsers. I tried following FredMcD's advice but that didn't fix it and I've also tried the usual clean installs of everything.

fergago said

Crash Reports for the Last 3 Days

All Crash Reports (including 1 pending crash in the given time range)

Some of your crash reports weren’t sent to the Mozilla Servers.

In the address bar, type about:crashes<enter>. Note: If any reports do not have BP in front of the numbers/letters, click it and select Submit.

The crash report is several pages of data. We need the report numbers to see the whole report.

Using your mouse, mark the most resent 7 - 10 crash reports, and copy them. Now go to the reply box below and paste them in.

It could be the work of one of your add-ons. Type about:addons<enter> in the address bar to open your Add-ons Manager. Hot key; <Control>(Mac:<Command>)<Shift> A)

In the Add-ons Manager, on the left, select Extensions. Disable a few add-ons, then Restart Firefox.

Some added toolbar and anti-virus add-ons are known to cause Firefox issues. Disable All of them.

If the problem continues, disable some more (restarting FF). Continue until the problem is gone. After, you know what group is causing the issue. Re-enable the last group ONE AT A TIME (restarting FF) until the problem returns.

Once you think you found the problem, disable that and re-enable all the others, then restart again. Let us know who the suspect is detective.

I found the guilty one my friend! (I wonder I should have better things to do on a Saturday night but... that's not this thread's topic) Here it is: HTTPS Everywhere. In fact, I didn't even need to disable it, but just to disable one of its rules for the ESPN site. The rule in question is called "Conviva (partial)". I don't have the least idea of what's it about (very common when one plays with unknown stuff). In case it's useful for some analysis, the other eight HTTPS Everwhere's rules for the ESPNPlay.com site are: Facebook NR-data.net New Relic.com Go.com (partial) Google APIs BootstrapCDN.com (partial) Twitter.com Akamai But these may remain enabled; it's "Conviva (partial)" the one that blocks the player (by the way, I noticed that it was not just preventing the video from loading, the whole player seemed to be frozen since the volume, play/pause, full screen, etc. buttons did not work). This is the link to the rule: https://www.eff.org/https-everywhere/atlas/domains/conviva.com.html Thanks and spread the word!!!!

That was very good work. Well Done. Please flag your last post as Solved Problem so others will know.

Thanks for your assistance.