What's your computer system and Firefox version?

Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options) key, and then starting Firefox. A small dialog should appear. Click Start In Safe Mode (not Refresh).

Is the problem still there?

On Mac with Mavericks OS. Went into Safe Mode. Some websites work but Walgreens, now as an example, won't even load.

Type about:support in the address bar and press Enter. Under the main banner, press the button; Copy Text To Clipboard.. Then in the reply box at the bottom of this page, do a right click in the box and select Paste. This will show us your system details. No Personal Information Is Collected.

I did this initially but here you go.

Application Basics

Name: Firefox Version: 50.0.2 Build ID: 20161129173726 Update Channel: release User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:50.0) Gecko/20100101 Firefox/50.0 OS: Darwin 13.4.0 Multiprocess Windows: 0/2 (Disabled by add-ons) Safe Mode: false

Crash Reports for the Last 3 Days

All Crash Reports

Extensions

Name: Ad-Aware Ad Block Version: 1.2.1.028 Enabled: true ID: AdBlockerLavaSoftFF@lavasoft.com

Name: Application Update Service Helper Version: 1.0 Enabled: true ID: aushelper@mozilla.org

Name: Ghostery Version: 7.1.1.5 Enabled: true ID: firefox@ghostery.com

Name: Multi-process staged rollout Version: 1.5 Enabled: true ID: e10srollout@mozilla.org

Name: Pocket Version: 1.0.5 Enabled: true ID: firefox@getpocket.com

Name: Web Compat Version: 1.0 Enabled: true ID: webcompat@mozilla.org

Name: Yahoo Mail Hide Ad Panel Version: 2.60 Enabled: true ID: {c37bac34-849a-4d28-be41-549b2c76c64e}

Name: Adobe Acrobat DC - Create PDF Version: 15 Enabled: false ID: web2pdfextension@web2pdf.adobedotcom

Name: McAfee SiteAdvisor Version: 2.0 Enabled: false ID: {4ED1F68A-5463-4931-9384-8FFF5ED91D92}

Graphics

Features Compositing: OpenGL Asynchronous Pan/Zoom: none WebGL Renderer: NVIDIA Corporation -- NVIDIA GeForce 9400 OpenGL Engine WebGL2 Renderer: (no info) Hardware H264 Decoding: Yes Audio Backend: audiounit GPU #1 Active: Yes Vendor ID: 0x10de Device ID: 0x0861

Diagnostics AzureCanvasAccelerated: 1 AzureCanvasBackend: skia AzureContentBackend: skia AzureFallbackCanvasBackend: none TileHeight: 512 TileWidth: 512

Important Modified Preferences

browser.cache.disk.capacity: 1048576 browser.cache.disk.filesystem_reported: 1 browser.cache.disk.hashstats_reported: 1 browser.cache.disk.smart_size.enabled: false 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.places.smartBookmarksVersion: 8 browser.sessionstore.upgradeBackup.latestBuildID: 20161129173726 browser.startup.homepage_override.buildID: 20161129173726 browser.startup.homepage_override.mstone: 50.0.2 browser.tabs.remote.autostart.2: true browser.urlbar.daysBeforeHidingSuggestionsPrompt: 0 browser.urlbar.lastSuggestionsPromptDate: 20161110 dom.apps.lastUpdate.buildID: 20161019084923 dom.apps.lastUpdate.mstone: 49.0.2 dom.apps.reset-permissions: true extensions.lastAppVersion: 50.0.2 media.benchmark.vp9.fps: 53 media.benchmark.vp9.versioncheck: 1 media.gmp-gmpopenh264.abi: x86_64-gcc3-u-i386-x86_64 media.gmp-gmpopenh264.lastUpdate: 1478534983 media.gmp-gmpopenh264.version: 1.6 media.gmp-manager.buildID: 20161129173726 media.gmp-manager.lastCheck: 1481066618 media.gmp-widevinecdm.abi: x86_64-gcc3-u-i386-x86_64 media.gmp-widevinecdm.lastUpdate: 1478534985 media.gmp-widevinecdm.version: 1.4.8.903 media.gmp.storage.version.observed: 1 media.webrtc.debug.log_file: /Users/bruceabrams/Library/Caches/TemporaryItems/WebRTC.log network.cookie.prefsMigrated: true network.dns.disablePrefetch: true network.http.speculative-parallel-limit: 0 network.predictor.cleaned-up: true network.prefetch-next: false places.database.lastMaintenance: 1480776294 places.history.expiration.transient_current_max_pages: 110961 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true print.print_bgcolor: false print.print_bgimages: false print.print_duplex: -437918235 print.print_evenpages: true print.print_in_color: true print.print_margin_bottom: 0.5 print.print_margin_left: 0.5 print.print_margin_right: 0.5 print.print_margin_top: 0.5 print.print_oddpages: true print.print_orientation: 0 print.print_page_delay: 50 print.print_paper_data: 0 print.print_paper_height: 11.00 print.print_paper_name: print.print_paper_size_unit: 0 print.print_paper_width: 8.50 print.print_resolution: -437918235 print.print_reversed: false print.print_scaling: 1.00 print.print_shrink_to_fit: true print.print_to_file: false print.print_unwriteable_margin_bottom: 13 print.print_unwriteable_margin_left: 13 print.print_unwriteable_margin_right: 13 print.print_unwriteable_margin_top: 13 storage.vacuum.last.index: 0 storage.vacuum.last.places.sqlite: 1481138678

Important Locked Preferences

Places Database

JavaScript

Incremental GC: true

Accessibility

Activated: false Prevent Accessibility: 0

Library Versions

NSPR Expected minimum version: 4.12 Version in use: 4.12

NSS Expected minimum version: 3.26.2 Version in use: 3.26.2

NSSSMIME Expected minimum version: 3.26.2 Version in use: 3.26.2

NSSSSL Expected minimum version: 3.26.2 Version in use: 3.26.2

NSSUTIL Expected minimum version: 3.26.2 Version in use: 3.26.2

Experimental Features

Sandbox

3213710 said

Some websites work but Walgreens, now as an example, won't even load.

Walgreens; Many site issues can be caused by corrupt cookies or cache.

• Clear the Cache and

• Remove Cookies
  Warning ! ! This will log you out of sites you're logged in to.

Type about:preferences<Enter> in the address bar.

• Cookies; Select Privacy. Under History, select Firefox will Use Custom Settings. Press the button on the right side called Show Cookies. Use the search bar to look for the site. Note; There may be more than one entry. Remove All of them.
• Cache; Select Advanced > Network. Across from Cached Web Content, Press Clear Now.

If there is still a problem, Start Firefox in Safe Mode {web link} A small dialog should appear. Click Start In Safe Mode (not Refresh). While you are in safe mode;

Type about:preferences#advanced<Enter> in the address bar.

Under Advanced, Select General. Look for and turn off Use Hardware Acceleration.

Poke around safe websites. Are there any problems?

Then restart.