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Thu, Aug 24, 2017 11:01 pm

Firefox - Detect Captive Portal

When you start the Firefox web browser, it will attempt to determine if the network connection available to it when it starts is via a captive portal. If you use a hotel's Wi-Fi service, a free WiFi service provided by a restaurant or other business, or some other public WiFi service, when you first open your browser you may see a web page asking you to accede to terms of service, an acceptable use policy, or to provide some authentication information, e.g., perhaps your name and room number for a hotel, or to provide payment information if you are accessing a wireless service that is not free. You won't be able to go elsewhere on the web, at least not easily, until you deal with the demands/conditions specified on the captive portal page.

Firefox makes a determination on whether there is a captive portal constraint by attempting to download the file success.txt from (there is only one word in that file, the word "success". If it can successfully retrieve that file, it can assume that it is not constrained by a captive portal. You can see such attempts using the free and open-source (FOSS) Wireshark packet analyzer utility by specifying a filter of "http.request.method == "GET".

[ More Info ]

[/network/web/browser/firefox] permanent link

Wed, Apr 12, 2017 10:02 pm

Firefox - the page isn't redirecting properly

If you are seeing a "Firefox has detected that the server is redirecting the request for this address in a way that will never complete" message, the problem may be resolved by removing cookies or history associated with the site, but you might also need to check the cookies exceptions list in Firefox; that's how I was finally able to resolve a problem accessing a particular site that I could access in another browser on a system, but not with Firefox.

When trying to log into the Rakuten Marketing website using Firefox 52.0.1 on a Windows 10 system, I saw the message below after being redirected to

The page isn't redirecting properly

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.

• This problem can sometimes be caused by disabling or refusing to accept cookies.

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[/network/web/browser/firefox] permanent link

Tue, Feb 28, 2017 10:57 pm

Viewing Firefox cookie information with sqlite3 on Mac OS X

On a Macintosh, aka Mac, OS X/macOS system, the user profile directory where the Firefox web browser stores its data can be found at "/Users/account_name/Library/Application Support/Firefox/Profiles" where account_name is the relevant user name. The profile directory for the account will be a sequence of 8 characters followed by ".default". E.g.:

$ ls "/Users/jasmith1/Library/Application Support/Firefox/Profiles"

Within that directory will be a cookies.sqlite file within which Firefox stores browser cookies. You can view those cookies outside of Firefox using the SQLite relational database management system software found on OS X/macOS systems. You can examine the sqlite file with the sqlite3 command, which you can run from a command line interface (CLI), i.e., a Bash shell prompt, by opening a Terminal window; the Terminal application is found in the Applications/Utilities directory. You can examine the structure of the database using the SQLite .schema command. There is a moz_cookies table within the database.

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[/network/web/browser/firefox] permanent link

Mon, Jan 23, 2017 10:07 pm

Firefox Profile Location on an Apple OS X System

The Firefox web browser stores information about its user settings and state in a "profile" directory for each user. On a Mac OS X system (now macOS), such as my MacBook Pro laptop, you can have Firefox open a Finder window showing you the relevant profile folder or you can find it from a command line interface (CLI), i.e., a shell prompt, by opening a Terminal window (you can find the Terminal program in the Applications/Utilities folder). For the latter method, you can see the location of the profile directory by issing the command ls -l ~/Library/Application\ Support/Firefox/Profiles. (you need to put a backslash before the space in the directory path)

$ ls -l ~/Library/Application\ Support/Firefox/Profiles
total 0
drwx------  53 jasmith1  ABC\Domain Users  1802 Jan 23 11:56 bgq13udo.default

[ More Info ]

[/network/web/browser/firefox] permanent link

Sat, Dec 24, 2016 4:32 pm

Remove a site's cookies from Firefox

The following steps can be taken to remove the cookies associated with a particular website in the Firefox browser. Note: these steps were taken on Firefox 50.0.2 on a Microsoft Windows 10 system, but should be applicable to other versions as well.
  1. Click on the 3 horizontal bars at the upper, right-hand corner of the Firefox Window.
  2. Click on Options.
  3. In the about:preferences window, click on Privacy.
  4. Under the History setion of the Privacy window, click on "remove individual cookies".
  5. In the Cookies window, scroll down to you find the relevant site.
  6. Click on the relevant site to select it, then click on the Remove Selected button.

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[/network/web/browser/firefox] permanent link

Fri, Sep 30, 2016 9:11 pm

No audio for YouTube videos played within Firefox

My wife could not hear audio today when she was viewing YouTube videos in the Firefox browser. She thought the problem occurred after the automatic update of Windows 10 on her system with the Anniversary Update. The YouTube audio setting was not muted and was turned up to a level where I should have heard sound and I found that I could hear audio for a music file outside of Firefox and I could hear audio for the YouTube video she was trying to view within the Microsoft Edge web browser on the system. And when I went to the CNN website, I was able to listen to the audio associated with a news video on the site.

The Browserspy website's Adobe Flash Information page showed the version of Flash installed on her system was

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[/network/web/browser/firefox] permanent link

Sat, Jul 23, 2016 6:09 pm

Adding Evernote add-on to Firefox on Linux

Evernote Corporation, which produces the Evernote note-taking application, unfortunately, doesn't provide an application for Linux as it does for Microsoft Windows and OS X, but you can use Evernote from within a browser, such as Firefox. To install Evernote support from within Firefox, take the steps listed here.

[/network/web/browser/firefox] permanent link

Wed, Jul 06, 2016 11:03 pm

Checking Firefox bookmarks on OS X from a shell prompt

I needed to be able to retrieve a Firefox bookmark for an account on a MacBook Pro laptop running OS X Yosemite (10.10.5). I wanted to be able to view the bookmarks from a command line interface (CLI), i.e., a shell prompt that I would get in a Terminal window. On an OS X system, the bookmarks and other account-unique information is stored beneath the profile directory for the account, which you can find beneath the ~/Library/Application Support/Firefox/Profiles directory.
$ ls ~/Library/Application\ Support/Firefox/Profiles

Within that directory is a places.sqlite SQLite database. OS X comes with the sqlite3 program for creating, viewing, and editing SQLite databases - see Using SQLite for information on how to use the program.

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[/network/web/browser/firefox] permanent link

Sun, Jan 17, 2016 4:34 pm

Reducing Firefox Memory Usage

If you are seeing high memory consumption by Firefox, put about:memory in the address bar of a tab and try the "Reduce memory usage" option, which triggers a global garbage collection followed by a cycle collection, and can reduce memory usage in other ways, e.g., by flushing various caches. If that doesn't sufficiently reduce memory, try the "Measure" option to view memory usage by Firefox, which will allow you to see usage information associated with URLs that can allow you to determine which tab or tabs you could close to significantly reduce Firefox's memory usage.

[ More Info ]

[/network/web/browser/firefox] permanent link

Sun, Dec 13, 2015 4:10 pm

Video DownloadHelper

Another add-on for Firefox for downloading videos from YouTube pages is Video DownloadHelper. The add-on works in Chrome as well and also will allow you to download videos from other sites as well as the YouTube site. Like the Download YouTube Videos as MP4 extension, it allows you to select from various resolutions for the downloaded video, so you can trade off resolution against file size, i.e., a higher resolution and larger file size or a lower resolution and smaller file size.

[/network/web/browser/firefox/addons] permanent link

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