16 votes
Accepted

What is the purpose of GETting this external file?

It is used by Firefox when detecting whether it is using a captive portal. A captive portal is a Web page that the user of a public-access network is obliged to view and interact with before access ...
Steve's user avatar
  • 8,458
7 votes

How to make a large icon appear in Firefox's new tab Top Sites?

After a lot of testing I was able to get large icons working for my website (in Firefox 57.0.4). I think it is important to use a large (>100px) icon and specify the size: <link rel="icon" type='...
lw1.at's user avatar
  • 231
6 votes

How do I make my site compatible with Firefox's Reader View feature

Check source code for Firefox: https://searchfox.org/mozilla-release/source/toolkit/components/reader/Readability.js * grabArticle - Using a variety of metrics (content score, classname, element ...
gavenkoa's user avatar
  • 283
6 votes

Can I omit the domain name for href in the HTML base tag?

No. The href must point to an absolute URI. Relative is not allowed on a base element. This attribute specifies an absolute URI that acts as the base URI for resolving relative URIs. The HTML5 ...
Rob's user avatar
  • 4,613
5 votes
Accepted

Delete Firefox JavaScript console history?

Enter this in the console: clearHistory() New in Firefox 39. Just like a normal command line, the console command line remembers the commands you've typed. Use this function to clear the console's ...
Geremia's user avatar
  • 201
5 votes
Accepted

How did Google, Comscore and Grapeshot learn of a secret page

"It feels like I have spyware on my computer." Oh, it's much worse than that. There is spyware on everything but your computer, probably. Grapeshot is an Oracle service. Here are a few ...
Trich's user avatar
  • 601
4 votes

What is the purpose of GETting this external file?

Captive portals are generally found at public wi-fi hot-sports, Starbucks, Airports. Firefox uses this to detect if it's trapped in a captive portal (success.txt not found) or can really ...
Gruber's user avatar
  • 245
4 votes
Accepted

How to show line numbers for HTML in Developer Tools?

What you're viewing may appear to be HTML, but it's not really HTML in the sense of a text document that has meaningful line numbers. It's the live Document Object Model (DOM) for the page, and it's ...
Maximillian Laumeister's user avatar
3 votes

Firefox reports SEC_ERROR_REVOKED_CERTIFICATE with a GoDaddy certificate and the website doesn't work

Your certificate has been revoked by the CA that issued it. If you go to https://www.ssllabs.com/ssltest/analyze.html?d=drmohanskinandhaircentre.com you can see: Revocation status Revoked ...
Patrick Mevzek's user avatar
3 votes

How do I make my site compatible with Firefox's Reader View feature

Have a <p> tag amazingly seems to be quite critical. For example this History of Mathematics page on Abu Kamil has very well formatted HTML but is still not enough. The critical problem appears ...
icc97's user avatar
  • 193
2 votes

Firefox remembering telephone number as username

You can do something like this: <input type="text" name="username" autocomplete="username"> <input type="default" name="email" autocomplete="email"> <input type="password" name="...
B. Martin's user avatar
  • 121
2 votes

Firefox remembering telephone number as username

It is generally not possible without reordering your fields or without a hack. Your username field has to be right before your password field in Firefox. I had the same issue but last name instead ...
Nelu's user avatar
  • 121
2 votes

What is the purpose of GETting this external file?

To disable this: Enter about:config into your location bar. Accept the risk. Locate and set network.captive-portal-service to false Source: https://www.blackhillsinfosec.com/towards-quieter-firefox/
kefs's user avatar
  • 121
2 votes
Accepted

Rewrite wildcard rule to redirect images that works with HTTP, HTTPS and Firefox HTTPS-Only mode

There's nothing in the directives you've posted that would cause this directly. Throwing a regex at this isn't going help. The RewriteRule directive you posted redirects to http - end of. So, any &...
MrWhite's user avatar
  • 42.8k
2 votes

Why the facebook pixel tests well in Chrome but not in Firefox?

Firefox blocks a lot of tracking these days. It's probably not an incompatibility so much as a deliberate design choice.
Kelson's user avatar
  • 21
2 votes

How can I avoid a too small h-bar (&hbar;) showing in Firexfox?

Your page appears to use the Google web fonts "Open Sans" and "Crimson Text". Neither of those fonts has a glyph for ℏ as tested by Google's tool: There are a couple Google fonts ...
Stephen Ostermiller's user avatar
2 votes

Designing for Firefox ( / accomodating for its bugs)

Firefox works quite fine in my experience, however, sometimes it can be overzealous in it's markup. So what you are describing as something that doesn't work, may most probably be not an error on the ...
Luis Alberto Barandiaran's user avatar
1 vote

Firefox doesn't update cache of a downloadable zip file. Why?

I would just add the version to the filename and you will circumvent the caching. or maybe change the caching headers: (Apache .htaccess file) <IfModule mod_expires.c> ExpiresActive On ...
Keith Tysinger's user avatar
1 vote

What is the tiny square image (similar to a favicon) to the left of each webpage title in the Open Tabs Screen on Firefox Mobile for Android?

If there is a favicon, Firefox will display that. If there is no favicon FireFox, (and some other apps) does its best fill the space and chooses the first letter of the URL. In your screenshot, 2 ...
Steve's user avatar
  • 8,458
1 vote

Why does Chrome show 304 in Response Headers section but 200 in Status code?

I understand from your question that you don't think it's pulling from cache. I'm not sure why you believe that or if I'm not understanding your question According to https://developer.mozilla.org/...
Trebor's user avatar
  • 3,270
1 vote

Why am I getting requests for /js/comm.js for my website?

A .js file is a javascript file which is generally used for adding rich client side behavior on your website. There could be a number of reasons why it is showing up in your 404 error log which all ...
Chris Rutherfurd's user avatar
1 vote

Duplicate CSS files in Firefox Inspector

Yes, it appears as though you may be linked to the CSS through a page that is also linked to another file (JS?) that is also linked to that same CSS. I can't be certain, but that's what it looks like....
psiclone's user avatar
1 vote

Apache - Firefox - Chrome RewriteCond help

why it works in Firefox and not Chromium. You are right to be puzzled, because that doesn't make much sense, unless... you are seeing some kind of cached response in Firefox, or you have previously ...
MrWhite's user avatar
  • 42.8k
1 vote

installing npm issue

Based on the first line it looks like it was expecting python 2.7 to be available. I think you probably need to install that set the env variable as it states and it should work. It's running through ...
user5823815's user avatar
1 vote

Firefox Addon to override system name resolution for certain host names?

Whilst this answer won't help if the "old" server (or whatever machine you want to test without making it public) is on localhost, it is a generic solution that will work with remote sites ...
Walf's user avatar
  • 176
1 vote

How can I have multiple sessions in FF without using profiles?

Firefox Multi-Account Containers seems to be the accepted solution for this nowadays.
vpzomtrrfrt's user avatar

Only top scored, non community-wiki answers of a minimum length are eligible