Certain web sites won't load on any browser on Macbook Pro

Starting yesterday certain web sites won't load on any browser (Safari or Chrome). These include sites like the New England Journal of Medicine, Washington Post, and English Bulldog News. I get an error message in Safari that the server took too long to respond and in Chrome I get a connection timeout error message. I updated Adobe Flash with a clean install as I was unable to update using the standard method due to connection timeout. That restored my access to YouTube video but today it takes ~2 minutes to load a YT video. Web sites are loading fine on my phone and household PCs.
Not sure if it is notable that my internet loading capacity has been very slow for some time. I worked with the internet company to increase the network speed but my computer has not seen benefit. No problems on the PCs in our house but my Macbook very frequently gets partially "kicked-off" the network as indicated by yellow lights seen next to the "internet" and "server" items in my Network Diagnostics utility.
I looked at old threads and ran EtreCheck (see results copied below) as was recommended to another user several months ago, but would appreciate any thoughts about where to go from here. Could it be malware? Or just a classic case of operator error? Here are the EtreCheck "red" items extracted from the full report below:
User Launch Agents: ℹ️
[loaded] com.adobe.ARM.[...].plist [Support]
[failed] com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist
Internet Plug-ins: ℹ️
Flash Player: Version: 16.0.0.235 - SDK 10.6 Cannot contact Adobe
FULL RESULTS:
EtreCheck version: 2.1.4 (107)
Report generated December 17, 2014 12:02:37 PM CST
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Click the [Adware] links for help removing adware.
Hardware Information: ℹ️
MacBook Pro (13-inch, Mid 2012) (Verified)
MacBook Pro - model: MacBookPro9,2
1 2.5 GHz Intel Core i5 CPU: 2-core
8 GB RAM
BANK 0/DIMM0
4 GB DDR3 1600 MHz ok
BANK 1/DIMM0
4 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
Intel HD Graphics 4000 - VRAM: 512 MB
Color LCD 1280 x 800
System Software: ℹ️
Mac OS X 10.7.5 (11G63b) - Uptime: 12:26:55
Disk Information: ℹ️
TOSHIBA MK5065GSXF disk0 : (500.11 GB)
disk0s1 (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / : 499.25 GB (261.25 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
MATSHITADVD-R   UJ-8A8
USB Information: ℹ️
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Computer, Inc. IR Receiver
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Inc. FaceTime HD Camera (Built-in)
Thunderbolt Information: ℹ️
Apple, Inc. MacBook Pro
Launch Daemons: ℹ️
[loaded] com.adobe.fpsaud.plist [Support]
[loaded] com.microsoft.office.licensing.helper.plist [Support]
User Launch Agents: ℹ️
[loaded] com.adobe.ARM.[...].plist [Support]
[failed] com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist [Details]
[loaded] com.citrixonline.GoToMeeting.G2MUpdate.plist [Support]
[loaded] com.google.keystone.agent.plist [Support]
[running] com.spotify.webhelper.plist [Support]
User Login Items: ℹ️
iTunesHelper ApplicationHidden (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Music Manager UNKNOWNHidden (missing value)
Speech Startup Application (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/SpeechRecogn ition.framework/Versions/A/Speech Startup.app)
Dropbox Application (/Applications/Dropbox.app)
Music Manager ApplicationHidden (/Users/[redacted]/Library/PreferencePanes/MusicManager.prefPane/Contents/Helpe rs/MusicManagerHelper.app)
Spotify Application (/Applications/Spotify.app)
Internet Plug-ins: ℹ️
Flip4Mac WMV Plugin: Version: 2.4.4.2 [Support]
FlashPlayer-10.6: Version: 16.0.0.235 - SDK 10.6 [Support]
QuickTime Plugin: Version: 7.7.1
Flash Player: Version: 16.0.0.235 - SDK 10.6 Cannot contact Adobe
AdobePDFViewer: Version: 10.1.4 [Support]
SharePointBrowserPlugin: Version: 14.3.2 - SDK 10.6 [Support]
Silverlight: Version: 5.1.30514.0 - SDK 10.6 [Support]
JavaAppletPlugin: Version: Java 7 Update 09 Check version
User internet Plug-ins: ℹ️
CitrixOnlineWebDeploymentPlugin: Version: 1.0.105 [Support]
3rd Party Preference Panes: ℹ️
Flash Player [Support]
Flip4Mac WMV [Support]
Java [Support]
MusicManager [Support]
Time Machine: ℹ️
Time Machine not configured!
Top Processes by CPU: ℹ️
      18% Google Chrome
      8% WindowServer
      2% SpeechRecognitionServer
      2% coreaudiod
      2% hidd
Top Processes by Memory: ℹ️
232 MB Google Chrome
189 MB System Preferences
129 MB Spotify
86 MB Spotify Helper
77 MB WindowServer
Virtual Memory Information: ℹ️
952 MB Free RAM
4.99 GB Active RAM
1.52 GB Inactive RAM
1.13 GB Wired RAM
1.02 GB Page-ins
0 B Page-outs
Diagnostics Information: ℹ️
Dec 16, 2014, 11:36:19 PM Self test - passed

Update: I ran Console upon trying to load a web site that won't load. Here are the messages from that action with any identical messages deleted:
12/17/14 1:45:51.013 PM [0x0-0x1b01b].com.google.Chrome: [201:2311:1217/134551:ERROR:location_bar_view_mac.mm(602)] Not implemented reached in virtual void LocationBarViewMac::EndOriginChipAnimations(bool)
12/17/14 1:45:51.000 PM kernel: Google Chrome He (map: 0xffffff8014ab4138) triggered DYLD shared region unnest for map: 0xffffff8014ab4138, region 0x7fff8a200000->0x7fff8a400000. While not abnormal for debuggers, this increases system memory footprint until the target exits.
12/17/14 1:46:16.515 PM [0x0-0x1b01b].com.google.Chrome: [604,1956432224:13:46:16.514831] Native Client module will be loaded at base address 0x00006a1600000000
12/17/14 1:46:16.000 PM kernel: Data/Stack execution not permitted: Google Chrome He[pid 604] at virtual address 0x107509000, protections were read-write
I forgot to note I have also done the obvious things like computer restart, shut down, and modem reset.

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