Open-source web browser. Include tag of operating system if it's important/dependent.

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241
votes
13answers
68k views

How can I simulate a slow connection, or limit the bandwidth that Firefox can use?

Is there a way I can simulate various connection speeds from within Firefox? I need to be able to check http://localhost with varying speeds. I know there are standalone applications that can do ...
107
votes
2answers
8k views

Why does Firefox use the “chrome://” protocol / schema in URLs? [duplicate]

When I want to configure an addon, for example Ghostery, the tab shows a URL like this one: chrome://ghostery/content/options.html What does it mean? Does it have something to do with the Chrome ...
94
votes
5answers
314k views

How to install the real Firefox on Debian?

Debian 6 ("Squeeze") uses a rebranded version of Firefox called Iceweasel. It, however, lacks plugin support, and most of my favorites don't work. So what is best way to install the "real" Firefox on ...
84
votes
1answer
6k views

Strange dotless decimal notation of IP address… How does it work?

Earlier today I thought I had a URL in my clipboard, but I actually had four 9 digit integers copied from a spreadsheet, which were identification numbers from a proprietary system. Completely ...
79
votes
7answers
53k views

How can I clear a single site from the cache in Firefox?

In Firefox, I occasionally need to clear my cache to fix a website. But clearing the entire cache seems like extreme overkill. Is there any way to just clear the one site from my cache?
55
votes
7answers
108k views

How to turn off the Firefox cache?

I'm using Firefox 3.5.2. For some reason, it has cached a page and won't update. For example, I added an alert('test'); statement to some JavaScript code which is loaded on the page, but Firefox ...
55
votes
1answer
1k views

How is a program that's not in my path being run? [duplicate]

Possible Duplicate: Why am I able to execute a program that is not in my PATH environment variable? I was teaching a coworker about %PATH% and found that if I run "Firefox", it works, but ...
53
votes
6answers
25k views

Determine which tab in Firefox is using CPU resources?

Is there anything in the current Firefox 3.x similar to shift-esc in Google Chrome? There is something that occasionally takes up enough CPU to make Firefox unresponsive - but with multiple windows, ...
52
votes
1answer
22k views

Why is YouTube buffering/loading behavior so horrible in Chrome?

I have been suffering from this for months, possibly even years, and I still don't have the slightest clue about the cause. Let's say I open a video on YouTube in Chrome, like Jamie Hyneman's ...
51
votes
1answer
2k views

Why does Firefox force a 3 second delay before installing add-ons?

I presume there is a security benefit to Firefox's delay before installing add-ons, but for the life of me I can't figure out what it is. (Yes, I know you can disable the delay.) If you answer this ...
49
votes
10answers
64k views

Force-refreshing only JavaScript files in Firefox and Chrome

I want to clear only JavaScript files from my web browsers (Firefox and Chrome). I am doing JavaScript debugging, and it's annoying that my JS just won't get updated whenever I change my JS files. The ...
49
votes
7answers
69k views

How to sync bookmarks across Google Chrome and Mozilla Firefox bookmarks?

How to sync bookmarks across Google Chrome and Mozilla Firefox bookmarks? As I, currently, understand, Google Chrome puts bookmarks seperatly from Google Bookmarks, which is accessible in Firefox by ...
47
votes
5answers
6k views

How to Determine which Firefox Add-ons are Using the Most Memory

I love Firefox for its add-ons. I have a lot of them installed, which obviously increases memory use. But it seems that some add-ons are better than others in that department. Does anyone know a way ...
44
votes
1answer
5k views

Firefox “Untrusted Connection” warnings when visiting reputable HTTPS sites when using child's account

When using Firefox on Windows, I see an "Untrusted Connection" warning when visiting any HTTPS site, including very reputable ones such as https://www.google.com and https://search.yahoo.com. The ...
43
votes
10answers
66k views

How to download favicon from website?

When you browse a web site, the "favicon" icon shows up next to the URL (or the bookmark). If I want that graphic, is there a way to download it directly from the site? I'd prefer to download it ...
43
votes
6answers
96k views

What is the “Google Update” Firefox add-on?

Browsing through Firefox's Add-ons list, I've discovered that there is one named Google Update, which I don't remember installing. How did it get on Firefox's list of installed Add-ons, or plugins, ...
42
votes
3answers
12k views

Clear 301-redirect cache in Firefox

Is it possible to clear only 301-redirects from Firefox's cache? CTRL+F5 doesn't do the job since you just reload the target without caching but do not clear the cached redirect. An option to disable ...
41
votes
4answers
14k views

What's the difference between Vimperator and Pentadactyl?

I've been using vimperator for a few months and loving it (although it makes it hard for me to go back to primitive mousery on others' computers). I've seen that there's a fork called Pentadactyl, but ...
38
votes
8answers
15k views

How safe is Firefox password manager?

I have been using the Firefox password manager for long time, but never checked/verified how secure it is.
37
votes
1answer
10k views

Does Firefox 30 still have the 3D DOM viewer?

I can't seem to make out this little feature that was once there in Firefox. The 3D button that was there in an earlier version of the dev tools is gone and I can't seem to find any trace of this ...
36
votes
6answers
156k views

Is there an “about:config” (Firefox) In Google's Chrome?

Anything similar to "about:config" (Firefox) In Google's Chrome ?
35
votes
3answers
12k views

Can a site detect if I use AdBlock in Firefox?

I recently visited (an official) website in search for an episode of a TV-show. The site popped an information dialog stating that I had to disable AdBlock to see the content. Is this at all possible ...
34
votes
7answers
3k views

How to forbid keyboard shortcut stealing by websites in Firefox

Many websites, especially everything involving rich text editing (this site is guilty as well), steal keyboard shortcuts normally used to control Firefox and make them do something else instead. It is ...
31
votes
8answers
28k views

Is there a method to export the URLs of the open tabs of a Firefox window?

If I have a Firefox window open that contains 10 tabs, is there a way in Firefox or by a plug-in to get the URLs of those 10 tabs as a text file or some other format? Right now if I want to do this I ...
31
votes
7answers
8k views

Changing Firefox Tab Cycle Order

When you use Ctrl-Tab in Firefox, you move through tabs in the order that they are listed in the tab bar at the top of the window. I would prefer that when I use Ctrl-Tab the next tab that I switch ...
31
votes
7answers
79k views

How do I Install Flash Player 10 without Adobe Download Manager?

How do I get Flash Player 10 (on Firefox) without installing the Adobe Download Manager?
30
votes
9answers
9k views

Flash overrides Firefox keyboard shortcuts — how to turn that off?

I often cycle through my Firefox tabs using Ctrl+Tab and Ctrl+Shift+Tab. But whenever it reaches a tab that is running a Flash (or similar) plugin, Ctrl+Tab and Ctrl+Shift+Tab won't work anymore, ...
29
votes
6answers
16k views

Firefox quickly forget HTTP Basic Auth

How can I make Firefox "invalidate" it's saved HTTP Basic Auth credentials for a website from the client side? Currently, I have to restart the browser, which is rather cumbersome with multiple tabs ...
29
votes
3answers
4k views

What is the difference between Mozilla Firefox and Mozilla Firefox Developer Edition?

Mozilla recently launched a new web browser named Mozilla Firefox Developer Edition, ostensibly designed for web developers. So I installed it, but I can't find much of a difference between regular ...
29
votes
13answers
61k views

Change the white background in webpages to another color

I'm currently using a dark theme in firefox. It looks really nice, but many webpages use a plain white background. The resulting contrast is a little unpleasant and sometimes hurts the eye when I ...
29
votes
3answers
9k views

How do I search a page using a regular expression in Firefox?

I want to use regular expressions to search a page in Firefox. Is this possible?
29
votes
8answers
66k views

How can I get a new browser session when opening a new tab or window on Firefox/Chrome?

When opening new Internet Explorer window, a new browser session is issued. Therefore you can login with two different accounts on the same service (let's say gmail). The same does not apply when ...
28
votes
7answers
14k views

What makes LastPass so secure?

I can't simply understand how using LastPass is secure. All an attacker need to do is to compromise the single LastPass account and then he has also compromised all other websites. What's so good ...
28
votes
3answers
1k views

Do disabled Firefox extensions make Firefox slower?

Do disabled Firefox extensions make Firefox slower? I know that extensions make browsing slower, but what about extensions that are disabled and not in use?
27
votes
6answers
8k views

How to disable permission to read 'System Fonts' and 'Browser Plugin Details' in Chrome and Firefox

Going to http://panopticlick.eff.org/ I can see that that Firefox and Chrome expose more about 'System Fonts' and 'Browser Plugin Details' than I prefer. How can the permission of a web page to ...
26
votes
5answers
18k views

Install Firefox 4 Beta alongside Firefox 3.6?

I have Firefox 3.6 installed and have just seen that Firefox 4 Beta is available. Is it possible for me to install Firefox 4 Beta alongside my current Installation of Firefox?
26
votes
5answers
9k views

How to run a regex search on Google Chrome or Firefox?

How can I search for expressions like 'foo|bar' on webpages using browsers like Google Chrome or Firefox?
26
votes
3answers
15k views

Is there a way to indicate what Firefox tab is making sounds?

I know that this is a very old issue, but it is still relevant as there has not been a solution to it in over 3 years now. But what I am essentially asking for is a Firefox equivalent to the Chrome ...
24
votes
1answer
9k views

What does Firefox do when “scanning for viruses” after download?

Never mind the fact that Firefox is a browser and not a AV tool, but what exactly does it do after a download? Even on systems that have an up-to-date AV this generates a pause of several seconds ...
24
votes
5answers
5k views

Make Chrome's Omnibar behave more like the Firefox AwesomeBar

One of my favorite features of the Firefox AwesomeBar is that I can simply type a substring of any URL or page title in my history and it finds all matches sorted by how frequently they were accessed. ...
23
votes
2answers
15k views

How to override the CSS of a site in Firefox with userContent.css?

In Mozilla Firefox, I want to create userContent.css which overrides the CSS of a site, say this one. Where should I create the file? Could you please describe it based on Windows 7?
22
votes
3answers
45k views

How to bypass the “secure connection failed” warning in Firefox 33

Since installing Firefox 33 a "Secure Connection Failed" error is no longer bypassable using the "I Understand the Risks" button - it's gone! Is it still somehow possible to ignore certificate ...
22
votes
2answers
5k views

Is there a way to identify the busy (CPU-consuming) tab in Firefox? [duplicate]

Sometimes there's a nasty, guilty, CPU-hogging tab in Firefox that's maxing one of my CPU cores and making the whole browser sluggish. I'd like to find it and close it. Sometimes I get lucky, but ...
20
votes
6answers
11k views

How can I disable HTML5 content in popular browsers like Firefox and Chrome?

The bad thing about Flash video was that it required a third-party plugin to play the content. The good thing was I could select which content to play; using the click-to-play feature in Firefox and ...
20
votes
4answers
3k views

How to make Firefox to spellcheck in multiple languages simultaneously?

I want to Firefox to assume that text may be in a mixture of languages and words should be looked up in multiple dictionaries. (For example, everything in en-GB, en-US, ru, be and be-classic should be ...
20
votes
4answers
11k views

Is there a HTML5 Validator plugin for Firefox?

Is there a plugin for firefox to validate HTML 5? I've always used this but if my webpage has a <!DOCTYPE HTML> doctype it complains about it not having a doctype at all. I specifically would ...
19
votes
8answers
11k views

Vimperator copy/pasting

I'm trying out Vimperator. I mainly wanted it for the hjkl scrolling, and I like its "hint" system for following links. These two features are really all I need; I think. I don't mind the other ...
19
votes
17answers
126k views

How to download a URL as a file?

A website URL has "hidden" some MP3 files by embedding them as Shockwave files, as follows. <span class="caption"><!-- Odeo player --><embed ...
19
votes
2answers
1k views

How do I prevent pages I visit from overriding selected Firefox shortcut keys?

In Firefox, how can I prevent pages from overriding Firefox built-in keyboard shortcuts through Javascript on a per-key basis? Preferably on a per-site basis, too? The most frustrating override is the ...
18
votes
8answers
6k views

Switching back to last tab on Firefox

Is it possible to switch back to the last tab used (tab toggling)? I often like this behaviour on the Mac OSX when switching between apps with the CMD + Tab shortcut key.