Add-ons let you add bells and whistles to Firefox. You can get add-ons that compare prices, check the weather, change the look of Firefox, listen to music, or even update your Facebook profile. This article covers the different types of add-ons available and how to find and install them.
Ruffle is a Flash Player emulator written in Rust. Ruffle runs natively on all modern operating systems as a standalone application, and on all modern browsers through the use of WebAssembly. Dec 17, 2020 What is interesting about Ruffle is that its developers have created browser extensions for Firefox, Chromium-based browsers such as Chrome, Edge, Brave, Opera, or Vivaldi, and for Safari. Installation of Ruffle in the browser of choice adds Flash emulation to the browser.
Table of Contents
- 1What types of add-ons can I install?
- 3Troubleshooting add-ons
These general types of add-ons can be installed:
- Extensions
Extensions add new features to Firefox or modify existing ones. There are extensions that allow you to block advertisements, download videos from websites, integrate Firefox with websites like Facebook or Twitter, and add features included in other browsers, such as translators. - Themes
Themes can decorate the menu bar and tab strip with a background image. Firefox also includes built-in themes. For more information on built-in themes, see Built-in themes in Firefox - alternative to complete themes. - Plugins
Firefox automatically downloads and installs the Google Widevine CDM for watching Digital Rights Management (DRM) controlled content and an OpenH264 plugin for video calls.You can install the Adobe Flash plugin for websites that use it for content such as video, animations and games.End of Flash support: Like other browsers and Adobe, Firefox ended Flash support at the end of 2020. Please see End of support for Adobe Flash for more information. - Dictionaries
Firefox can check your spelling, but not all locales come with a dictionary installed due to licensing reasons. You can find and install a dictionary for your language. (To change the language of the Firefox user interface, see the article Use Firefox in another language.) - Search engines
Firefox comes with a number of search engines already installed. You can access them from the Search bar (if enabled) or directly from the address bar. If you want additional search engines, you can install them on the websites directly or from addons.mozilla.org.
Viewing and managing your installed add-ons
Search engines can be viewed and managed in the Search panel in Firefox OptionsPreferencesSettingsPreferences. For other add-ons:
- Click the menu button and choose Add-ons. The Add-ons Manager tab will open.
- Select the panel for the type of add-on you wish to view or manage, such as the Extensions, Themes or PluginsExtensions or Themes panel.
For detailed information on disabling or removing add-ons, see Disable or remove Add-ons.
Here is an overview to get you started:
- Firefox may offer personalized recommendations. Click the menu button , click Add-ons and Themes Add-ons and Themes Add-ons and select Recommendations.
- To install a recommended add-on, click the blue or button, depending on the type of add-on.
At the bottom of the list of recommended add-ons, there's also a button you can click. It will take you to addons.mozilla.org where you can search for specific add-ons.
Some extensions place a button in the toolbar after installation. You can remove those or move them into the menu if you want - see Customize Firefox controls, buttons and toolbars.
For information on troubleshooting problems with extensions, plugins, or themesextensions or themes, see the articles below.
Problems with installing or uninstalling add-ons
Problems caused by add-ons
A Firefox profile stores all of your important data, such as your bookmarks, history, cookies, and passwords. This article explains how to copy the files to a new profile, lists important files in the profile and describes what information is stored in these files.
- To switch to another profile to recover missing data and settings, see Recover user data missing after Firefox update.
Table of Contents
- 4Your important data and their files
Before starting it is recommended that you make a complete backup of your existing Firefox profile in case something goes wrong. Please read the Back up and restore information in Firefox profiles article for instructions.
For information on how to create a brand new Firefox profile, please read the Profile Manager - Create, remove, or switch Firefox profiles article.
Open your profile folder:
- Click the menu button , click Help and select Troubleshooting InformationMore Troubleshooting Information.From the Help menu, select Troubleshooting InformationMore Troubleshooting Information. The Troubleshooting Information tab will open.
- Under the Application Basics section next to Profile FolderDirectory, click . A window will open that contains your profile folder.Your profile folder will open.
Note: If you are unable to open or use Firefox, follow the instructions in Finding your profile without opening Firefox.- Click the Firefox menu and select Exit.Click the Firefox menu at the top of the screen and select Quit Firefox.Click the Firefox menu and select Quit.
- Right-clickHold down the control key while you click on a file you want to copy and choose Copy.
- Open the new Firefox profile folder.
- Right-clickHold down the control key while you click inside the profile folder and choose Paste Item.
Repeat steps 3-5 for each file you wish to transfer over to your new profile folder.
While copying your personal data from an old Firefox profile to a new Firefox profile, it is possible that you could copy over the file that is causing the problem you are trying to get rid of! The more files you copy over, the greater the chance of this happening. It is therefore recommended that:
- You copy over only the minimal amount of files that contain your most important data that you simply can't live without.
- You copy over a few files at a time, and then check that the problem you are trying to get rid of hasn't returned.
Bookmarks, Downloads and Browsing History
- places.sqlite
This file contains all your Firefox bookmarks and lists of files you have downloaded and of websites you have previously visited. For more information, see Bookmarks in Firefox.
- favicons.sqlite
This file stores website favicon images. It's best to also include this file when recovering the places.sqlite file.
Passwords
Your passwords are stored in two different files, both of which are required:
- key4.db
This file stores your key database for your passwords. To transfer saved passwords, you must copy this file along with the following file.
- logins.json
Encrypted information about your saved usernames and passwords.
For more information see Password Manager - Remember, delete and edit logins and passwords in Firefox.
Site-specific preferences
- permissions.sqlite
This file stores many of your Firefox permissions that are decided on a per-site basis. For example, it stores which sites are allowed to, or blocked from setting cookies, installing extensions, displaying popups, etc.
Search engines
- search.json.mozlz4
This file stores user-installed search engines. For more information, see Add or remove a search engine in Firefox.
Personal dictionary
- persdict.dat
This file stores any custom words you have added to Firefox's dictionary. If you have never added a custom word to the Firefox dictionary, then you will not have this file. For more information see How do I use the Firefox spell checker?.
Autocomplete history
- formhistory.sqlite
This file remembers what you have searched for in the Firefox search bar and what information you have entered into forms on websites. For more information see Control whether Firefox automatically fills in forms.
Cookies
- cookies.sqlite
Cookies are used by websites for a variety of reasons, some of which include keeping you logged in to a website you have previously logged in to, remembering any preferences a website has allowed you to set, authenticating you as a person who has visited a specific website before, etc.
Security certificate settings
- cert9.db
Ruffle Microsoft Edge
This file stores all your security certificate settings and any SSL certificates you have imported into Firefox.
File types and download actions
- handlers.json
Ruffle Browser Extension
This file stores your preferences with respect to what Firefox does when it comes across known file types, such as whether you want to save a file or open it with a specific application. For more information see Change what Firefox does when you click on or download a file.
Ruffle Firefox Browser
Based on information from Transferring data to a new profile - Firefox (mozillaZine KB)