That seems pretty high if you aren't busy downloading large files or watching HD content.

First, here's an article about the automatic connections that Firefox makes. Other than updating itself, the data involved should be very small, but it still might be worth turning some of them off: How to stop Firefox from making automatic connections.

Second, please check your extensions and disable all but the most essential. You can view, disable, and often remove unwanted or unknown extensions on the Add-ons page. Either:

• Ctrl+Shift+a (Mac: Command+Shift+a)
• "3-bar" menu button (or Tools menu) > Add-ons
• type or paste about:addons in the address bar and press Enter/Return

In the left column of the Add-ons page, click Extensions.

Then cast a critical eye over the list on the right side. Any extensions Firefox installs for built-in features are hidden from this page, so everything listed here is your choice (and your responsibility) to manage. Anything related to downloading, that looks suspicious, or that you just do not remember installing or why? If in doubt, disable (or remove).

Third, some malware may install its own copy of Firefox to sneak traffic over the network. If you have exited out of Firefox but you still see it running in the Windows 10 Task Manager (after allowing a half minute for it to complete its shutdown), we can suggest ways to investigate why that might be happening.

I really can't understand that amount of Data usage. When I check my system, there's no comparison. Seems suspicious.

Thank you very much for a quick feedback.

However the information does not solve the issue.

I wasn't downloading large files or watching HD content.

1. On the first point: I checked the article. This is a new set up. And I have a Trend Micro running on the computer. The only 3 downloads I have are a few (1-4 MB files), so it is not re-downloading. The other options on these articles should not accumulate to 160gb download in 1 day.

2. Second point: I had 0 extensions running. I just turned on Trend Micro extension just now.

3. Third point: Firefox was open when this happened.

Is there a way to see what Firefox download on an hourly basis?

A new idea which came to me, is concerning: Web.Whatsapp.com: the web application was open on firefox. When I clicked on a picture to be opened, could the website have downloaded all the photos on all groups at once? But if that were the case, where is the data? There is not enough disk space for that on the harddisk.

The computer updated Windows 10 in the afternoon. Firefox is the default web browser. Can that be related?

Finally, could this issue be related to Windows 10's constant sharing of data?

Any other thoughts?

Alp

Hi Alp, for hourly activity, you could view History to see what URLs were retrieved. In many cases, those retrievals go into the disk cache, but many are just saved in memory. Firefox doesn't repeat URLs in History, you only see the latest visit, so if something was loaded 100 times, the only way to know that is to show the Visit Count column.

To see whether Whatsapp or any other site is using a lot of storage -- not counted as a download -- you can look at site storage sizes on the Options page, Privacy & Security panel, Cookies and Site Data section, "Manage Data" button.

I don't think Windows updates would come through Firefox; I think Microsoft uses a direct channel and it would show up under "System" or something like that.

I'm not familiar with Windows sharing, but I don't think that would come through Firefox, either.

I really can't understand that amount of data.

Thanks again for the quick update. I cant understand it either.

The ISP confirms that the data was downloaded, and my package is depleted. I have to buy additional internet.

I looked at the last 24 hour URLS's Visit Column. The only repeating website is my gmail. All others are below 10.

When I look at Manage Data button the WebWhatsApp's cookies are totalling at 12Mb. And that is 3rd in line after 14Mb gmail.

Thank you for the comments.

If there aren't anything else we can check, then I am going to have to remove firefox (my preffered web browser for over 20 years) from my computer with a broken heart.

Best Regards,

Alp

@jscher2000 Could speculative background loading do something like this?

Jeff Grossman said

@jscher2000 Could speculative background loading do something like this?

I don't know that Firefox would be triggered to pre-fetch anything while the user is idle. Some pages refresh themselves at regular intervals, such as news sites, but the page weight on those sites shouldn't add up to anything so enormous.

I have Trend-Micro. It regularly downloads vast quantities. For example, on my machine at this moment, "coreServiceShell.exe" has read 106,828,801,346 bytes, written 2,136,558,412 bytes, and "other"-ed 27,806,157,382 bytes.

Type about:support in the address bar and press Enter. Under the main banner, press the button; Copy Text To Clipboard.. Now in the Reply Box on the forum page, do a right-click in the box and select Paste.

If the data is too big, do not worry. It's the top part we need to look at.

This will show us your system details. No Personal Information Is Collected.

Application Basics

Name: Firefox Version: 75.0 Build ID: 20200403170909 Update Channel: release User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 OS: Windows_NT 10.0 Launcher Process: Enabled Multiprocess Windows: 1/1 Enabled by default Remote Processes: 7 Enterprise Policies: Inactive Google Location Service Key: Found Google Safebrowsing Key: Found Mozilla Location Service Key: Found Safe Mode: false

Crash Reports for the Last 3 Days

Firefox Features

Name: DoH Roll-Out Version: 1.3.0 ID: doh-rollout@mozilla.org

Name: Firefox Screenshots Version: 39.0.0 ID: screenshots@mozilla.org

Name: Form Autofill Version: 1.0 ID: formautofill@mozilla.org

Name: Web Compat Version: 9.0.0 ID: webcompat@mozilla.org

Name: WebCompat Reporter Version: 1.1.0 ID: webcompat-reporter@mozilla.org

Remote Processes

Type: Web Content Count: 5 / 8

Type: Extension Count: 1

Type: GPU Count: 1

Extensions

Name: Amazon.com Version: 1.1 Enabled: true ID: amazondotcom@search.mozilla.org

Name: Bing Version: 1.1 Enabled: true ID: bing@search.mozilla.org

Name: DuckDuckGo Version: 1.0 Enabled: true ID: ddg@search.mozilla.org

Name: eBay Version: 1.0 Enabled: true ID: ebay@search.mozilla.org

Name: Google Version: 1.0 Enabled: true ID: google@search.mozilla.org

Name: Trend Micro Toolbar Version: 16.0.0.1306 Enabled: true ID: fftmtoolbar@trendmicro.com

Name: Twitter Version: 1.0 Enabled: true ID: twitter@search.mozilla.org

Name: Wikipedia (en) Version: 1.0 Enabled: true ID: wikipedia@search.mozilla.org

Name: Yandex Version: 1.0 Enabled: true ID: yandex@search.mozilla.org

Security Software

Type: Windows Defender Antivirus

Type:

Type: Windows Firewall

Graphics

Features Compositing: WebRender Asynchronous Pan/Zoom: wheel input enabled; scrollbar drag enabled; keyboard enabled; autoscroll enabled WebGL 1 Driver WSI Info: EGL_VENDOR: Google Inc. 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Did the problem start when you updated to v75?

It happened on 1 day on April 15. Not sure, if or when Mozilla was updated.

No further comments? Any help so I dont experience this again?