pop up window -- what is the cause/solution?

This is the window, except that it contains my SSID number for the modem I am connected which is not this number.

Read articles for this issue another person had at: Connecting to wireless triggers error message on apple.com

Tried:

I DID THE FOLLOWING AS WELL AS APPLE DIAGNOSTIC ON WIFI (it showed not problems, as did the Malwarebytes scan, no issues).

RESTARTING, removed location services ability at Safari>Sys Pref>Privacy, REBOOTING MODEM (UNPLUG AT LEAST 30 SECONDS), REMOVED AND PUT BACK CABLES SECURING INTO MODEM, unplugged Windows 98 that was plugged into modem, removed location services (Safari syst Pref. Privacy — from deny to ask once a day, and Adblock Plus after update moved it back to 'deny' option), in Asfari>Sys Pref> Privacy & Security — blocked screen sharing (Firewall Advanced)

using: http://osxdaily.com/2014/10/25/fix-wi-fi-problems-os-x-yosemite/

This is what I did:

2: Create a New Wi-Fi Network Location with Custom DNS

In SysPref> Network>Advanced> Hardware the configure from automatically to manual and the custom 1453 instead of the standard 1500 did not hold (I did click OK) When I check back it is at the automatic and standard 1500 setting. And changing the name of the network also did not hold. (Right after I did this the pop up came up with 'Join "Presto"' at the top of the pop up window instead of my SSID #. ) Also before attempting to make these

changes the DNS Servers was blank and now it has two numbers listed (don't know if these give personal info so I won't list them here ....... they both begin with 64.59. ... . .. (9 numbers). The set up is for WPA2 Personal as this article says is best.

The thing is that the window is not popping up when I put computer to sleep when I am online too and often, where as previously it was rarely (every 12th time using computer) and only on page that appears after log-in (on which I have top-sites.)

also: after the below did: Safri Sys Tref >General — new tabs open with "Top Sites" (2017— it was "homepage" [which is an apple.com address)

next, after all this -- I'll post the EtreCheck Report

What 'page am i trying to open' when this pop up happens only right after

login, and I am using my top sites to appear at that time?

I notice that DropBox upgraded automatically on my computer, at the end of July and the end of August 2018.

Could that possibly cause this situation.

EtreCheck version: 4.0.4 (4A150)

Report generated: 2018-09-10 18:06:31

Download EtreCheck from https://etrecheck.com

Runtime: 1:45

Performance: Excellent

Problem: Other problem

Description:

pop up window

Major Issues:

Anything that appears on this list needs immediate attention.

No Time Machine backup - Time Machine backup not found.

Old operating system - Old operating system versions no longer receive security updates.

Minor Issues: None

Hardware Information:

MacBook Air (13-inch, Mid 2013)

MacBook Air Model: MacBookAir6,2

1 1.3 GHz Intel Core i5 (i5-4250U) CPU: 2-core

4 RAM Not upgradeable

BANK 0/DIMM0

2 GB DDR3 1600 ok

BANK 1/DIMM0

2 GB DDR3 1600 ok

Battery: Health = Normal - Cycle count = 392

Video Information:

Intel HD Graphics 5000 - VRAM: 1536 MB

Color LCD 1280 x 800

Drives:

disk0 - APPLE SSD SD0128F 121.33 GB (Solid State - TRIM: Yes)

Internal PCI 5.0 GT/s x2 Serial ATA

disk0s1 - EFI [EFI] 210 MB

disk0s2 - Macintosh HD [Core Storage Container] 120.47 GB

disk1 - Macintosh HD (Journaled HFS+) 120.10 GB

disk0s3 - Recovery HD [Recovery] 650 MB

Mounted Volumes:

disk1 - Macintosh HD 120.10 GB (84.24 GB free)

Journaled HFS+

Mount point: /

Network:

Interface Bluetooth-Modem: Bluetooth DUN

Interface en0: Wi-Fi

802.11 a/b/g/n/ac

One IPv4 address

Interface en2: Bluetooth PAN

Interface bridge0: Thunderbolt Bridge

System Software:

OS X Yosemite 10.10.5 (14F2511)

Time since boot: About 2 hours

System Load: 1.64 (1 min ago) 1.23 (5 min ago) 1.18 (15 min ago)

Security:

System Status

Gatekeeper Mac App Store and identified developers

System Launch Agents:

[Not Loaded] 5 Apple tasks

[Loaded] 154 Apple tasks

[Running] 54 Apple tasks

System Launch Daemons:

[Not Loaded] 46 Apple tasks

[Loaded] 151 Apple tasks

[Running] 66 Apple tasks

Launch Daemons:

[Loaded] com.malwarebytes.HelperTool.plist (Malwarebytes Corporation - installed 2017-02-09)

User Launch Agents:

[Loaded] com.dropbox.DropboxMacUpdate.agent.plist (Dropbox, Inc. - installed 2018-07-24)

User Login Items:

SpeechSynthesisServer Application

(/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ SpeechSynthesis.framework/Versions/A/SpeechSynthesisServer.app)

Internet Plug-ins:

Default Browser: 600 (installed 2015-08-14)

QuickTime Plugin: 7.7.3 (installed 2017-07-20)

Safari Extensions:

Adblock Plus.safariextz - Eyeo GmbH - https://adblockplus.org/ (installed 2018-09-07)

Time Machine:

Time Machine Not Configured!

Top Processes by CPU:

Process (count) Source % of CPU

mdworker (7) Apple 8

WindowServer Apple 5

mds Apple 4

kernel_task Apple 1

helpd Apple 0

Top Processes by Memory:

Process (count) Source RAM usage

kernel_task Apple 446 MB

helpd Apple 136 MB

mds_stores Apple 91 MB

cfprefsd (2) Apple 85 MB

mdworker (7) Apple 84 MB

Top Processes by Energy Use:

Process (count) Source Energy usage (0-100)

WindowServer Apple 3

airportd Apple 0

spindump_agent Apple 0

coresymbolicationd Apple 0

cfprefsd (2) Apple 0

Virtual Memory Information:

Available RAM 2.13 GB

Free RAM 699 MB

Used RAM 1.87 GB

Cached files 1.44 GB

Swap Used 46 MB

Diagnostics Information (past 7 days):

2018-09-10 15:43:45 imagent.app CPU

2018-09-10 15:36:56 sharingd CPU

2018-09-07 18:35:17 com.apple.AmbientDisplayAgent Crash

abort called error for object 0x7f996b619248: incorrect checksum for freed object - object was probably modified after being freed.

End of report

Is that what this error reference is from the Etre Check report that I have posted here?

Diagnostics Information (past 7 days):

2018-09-10 15:43:45 imagent.app CPU

2018-09-10 15:36:56 sharingd CPU

2018-09-07 18:35:17 com.apple.AmbientDisplayAgent Crash

abort called error for object 0x7f996b619248: incorrect checksum for freed object - object was probably modified after being freed.