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  1. How to display only modified preferences on about:config in Firefox The internal about:config interface of the Firefox web browser is a handy tool to make advanced configuration changes to the browser including many that users would not be able to change otherwise and many that other browsers don't provide at all. Mozilla launched a redesign of the about:config page in recent versions of the Firefox web browser; the new design uses open standards such as HTML and JavaScript and was introduced in early 2019 in development versions of the browser. The initial redesigned version received some criticism as Mozilla launched it without full replication of functionality of the old version. Main points of criticism included that deep linking was no longer supported, that the data could not be sorted anymore, that all preferences could not be listed on the page, and that double-clicks to edit values or change states were not working as well. Mozilla addressed some of these issues in recent updates. It is now possible to display all preferences and to use double-clicks. Sorting and deep linking on the other hand are not supported in Firefox Stable at the time of writing and Mozilla revealed earlier that it won't introduce these features. Firefox users who want to take a look at all modified preferences have a new option now to display all changed preferences on about:config. The listing of core modified preferences on about:support displays only some of the preferences but not all that are modified. Here is how you display all modified (non-default) Firefox preferences on about:config: Load about:config in the Firefox address bar. Confirm that you will be careful if the warning is displayed. Activate the "show all" link to display all preferences. Use the keyboard shortcut Ctrl-Shift-K (on Mac Command-Option-K) to display the Console of the Developer Tools. Type allow pasting to enable the pasting of commands. Paste the following in the console and hit the Enter-key afterwards. var elements = document.getElementsByTagName('tr'); [...elements].filter( el => !el.classList.contains('has-user-value') ).forEach( el => el.style.display = (el.style.display === 'none') ? 'table-row' : 'none' ); The instructions parse the data and display only preferences that have been modified. You can go through the listing easily this way to check all modified preferences in the Firefox browser. The change is temporary in nature, a reload loads the standard listing again. Closing Words It may sometimes be useful to check modified preferences, e.g. when something is not working right in Firefox and you are uncertain whether it is caused by one of the preferences. or when you want to make sure that certain preferences are still set to the values that you set them to. Source: How to display only modified preferences on about:config in Firefox (gHacks - Martin Brinkmann)
  2. About:config is blocked in Firefox Preview Stable and Beta Mozilla is working on a new mobile browser for Google's Android operating system. Called Firefox Preview currently, it is available as a preview version right now. As is the case with desktop Firefox, Firefox Preview for Android is available in different editions that differ in terms of stability and development progress. Firefox Preview Stable is the main version that is comparable to Firefox Stable for desktop operating systems. There is also Firefox Preview Beta and Firefox Preview Nightly for Developers. While there are not many major differences in regards to core functionality between the different editions usually, it appears that Mozilla decided to implement one in Firefox Preview that might irritate some users of Stable or Beta versions of the browser. Firefox supported the internal about:config page for a long time; it provides an interface to make advanced configuration changes directly in the web browser. Firefox for the desktop and mobile supported it until now. When you try to load about:config in Firefox Preview Stable or Firefox Preview Beta, you are greeted with a "cannot complete request" message instead. The page states that "additional information about this problem or error is currently unavailable", and there is a "try again" button to retry loading the page. It is unclear at this point if the change is deliberate or if Mozilla plans to unblock the page before final release. As it stands, Firefox Preview Stable and Beta users cannot make use of about:config to make changes to Firefox's configuration. If you compare that to the current Firefox mobile browser for Android, which supports about:config, you have to wonder whether that is an intentional change or something that just has not been implemented yet. It seems expected behavior judging from the post of a contributor on the official GitHub project website: This is expected behavior from GeckoView. Fenix does not control access to it. When Fenix nightly is released it will have access to about:config for users that have that requirement. Closing Words It is probably not a good idea to release Firefox Stable or Beta versions for Android without support for about:config as users who used it in the past will certainly be disappointed that the feature is not available. It is also difficult to justify considering that the previous Firefox for Android supported it and desktop Firefox Stable supports it as well. Source: About:config is blocked in Firefox Preview Stable and Beta (gHacks - Martin Brinkmann)
  3. The Firefox web browser displays a list of top sites on the web browser's New Tab page by default next to a search field, highlights, soon downloads, and recommendations. Mozilla changed the New Tab Page in Firefox 57 and introduced something that it called Activity Stream on it. Top Sites are displayed just below the search form on the New Tab page in the Firefox browser. Firefox displays a single row of websites and services by default. Top Sites are sites that are visited the most. Firefox gives users options to pin sites so that they become available. Each site you pin to Top Sites takes away a spot that is filled automatically by the browser. You can also dismiss sites to hide them from the Top Sites listing and rearrange Top Sites using drag and drop. How to add more Top Sites rows to Firefox It is easy enough to increase the row count to two as Mozilla added an option to do so. A click on the cogwheel icon on the New Tab page displays options to hide any element on it. You find the "show two rows" option under Top Sites and a second row is added to the Top Sites listing when you check it. Note: Mozilla plans to move the preferences from the New Tab Page to the Settings. A click on the icon on the New Tab page opens the Firefox preferences then where you can make the change. Two rows of Top Sites may be sufficient for some Firefox users but what if you want more rows to display even more Top Sites on the New Tab page? Firefox comes with built-in functionality to extend the Top Sites listing to more than two rows. You need to modify the web browser's configuration for that: Load about:config?filter=browser.newtabpage.activity-stream.topSitesRows in the Firefox address bar. Double-click on the preference browser.newtabpage.activity-stream.topSitesRows and change its value to the desired number of rows and click ok. Check the New Tab Page to see the change right away and modify the number of rows accordingly if needed. You can undo the change at any time in the following ways: Right-click on the preference on about:config and select "reset" from the context menu. Double-click on the preference and change the value to 1. Ghacks.net
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