Usein kysyttyjä kysymyksiä

Lisäosien käyttö

Mikä lisäosa on?
Lisäosat ovat pieniä ohjelmia, jotka tuovat uusia ominaisuuksia Firefox -ohjelmaan. Lisäosat voivat lisätä Firefox -ohjelmaasi uusia ominaisuuksia, vieraiden kielien sanakirjoja tai muuttaa käyttöliittymää. Lisäosien ansiosta voit muuttaa Firefox -ohjelmaasi tarpeidesi ja mieltymystesi mukaan. Lisätietoja mukauttamisesta
Toimivatko lisäosat verkkoselaimessani tai sovelluksessani?
Tällä sivustolla esitetään vain Mozilla-pohjaisille ohjelmistoille, kuten Firefoxille, Firefox Mobilelle, SeaMonkeylle ja Thunderbirdlle kehitettyjä lisäosia. Kaikki lisäosat eivät kuitenkaan toimi kaikkien edellä mainittujen ohjelmistojen kanssa eivätkä välttämättä tietyssä versiossa. Lisäsosan kehittäjä valitsee, mille ohjelmistoille hän suunnittelee lisäosansa, kuten Firefoxin versioille 4.0 - 11.0 *. Firefoxin lisäosille asennuspainike näkyy sinulle aina riippumatta siitä, onko lisäosa yhteensopiva ohjelmistosi kanssa.
Minkälaisia lisäosia on tarjolla?
Voit mukauttaa Firefox -ohjelmistoasi monilla tavoilla:
  • Laajennukset lisäävät uusia ominaisuuksia Firefox -ohjelmistoon tai muuttavat nykyisiä. Laajennus voi vaikkapa poistaa sivustojen mainokset, tuoda videotukea tai integroida selaimeesi sosiaalisia verkostoja.
  • Complete Themes change the entire appearance of Firefox, usually including icons, colors, dialogs, and other visual styles.
  • Themes are lightweight themes that use background images to customize your Firefox toolbars.
  • Hakutyökalut lisää uusia hakukoneita hakupalkkiin. Tämän ansiosta voit helposti etsiä tietoa eri verkkopalveluista.
  • Oikolukusanastot ja kielipaketit lisäävät Firefox -ohjelmaan tuen muille kielille.
  • Liitännäiset auttavat Firefox -ohjelmaasi ymmärtämään uusia tiedostomuotoja, kuten Adobe Flashia tai Apple Quicktimea.
Miten voin asentaa, poistaa tai hallita lisäosiani?
In most cases, add-ons can be installed by simply clicking the install button provided. Add-ons can be managed, disabled, or uninstalled from the Add-ons Manager in Firefox. For more detailed instructions, read this article on extensions or this one for Themes and Complete Themes. If you have difficulty installing add-ons, see Troubleshooting Extensions and Themes.
How do I install add-ons without restarting Firefox?
In Firefox, add-ons marked with "No restart required" can be installed without restarting. These add-ons have been created using the Add-on SDK or bootstrapping. Other add-ons will still require a restart before you can use them.
How do I keep add-ons up-to-date?
Add-ons, unlike plugins, are automatically checked for updates once every day. In Firefox, updates are automatically installed by default. Versions of Firefox prior to 4 (and other applications) will alert you that updates to your add-ons are available. Plugins are not currently automatically checked for updates, so be sure to regularly visit the Plugin Check page to stay up-to-date.
Are add-ons safe to install?
Unless clearly marked otherwise, add-ons available from this gallery have been checked and approved by Mozilla's team of editors and are safe to install. We recommend that you only install approved add-ons. If you wish to install unapproved add-ons or add-ons from third-party websites, use caution as these add-ons may harm your computer or violate your privacy. Learn more about our approval process
Can add-ons make Firefox slower?
Most add-ons do not cause a perceivable performance decrease in Firefox, though installing an excessive number may have adverse effects. If you suspect an add-on is causing Firefox to be slow, try disabling it.
Firefox told me an add-on isn't compatible. Is there a way I can still use it?
If an add-on isn't compatible with your version of Firefox, it is usually either because your version of Firefox is outdated or the add-on author has not yet updated the add-on to be compatible with a newer version you are using. Mozilla does not recommend trying to circumvent these compatibility checks, as they can lead to browser instability or in some cases loss of data. For users who are testing out alpha or beta versions of Firefox, we offer the Add-on Compatibility Reporter to help add-on developers update their compatibility.
What if I have problems with an add-on?
Add-ons are usually created by third-party developers from around the world, so the best way to get help with an add-on is to look for support links on the add-on's homepage or contact the developer. If you are having issues with Firefox that you suspect are related to add-ons you have installed, visit this support article for troubleshooting tips.
How do I choose between add-ons that seem to do the same thing?
There are often several add-ons that have similar features. To figure out which is right for you, read the entire description of the add-on and view its screenshots. If there are still several in the running, read through the add-on's ratings, user reviews, and statistics to see which is most liked by other users. Remember that you can also just try out both and see which you like better.
What if I can't find an add-on I'm looking for?
With thousands of add-ons available, there's something for everyone. But if you're looking for a particular add-on and can't find it, you might try searching on other sites or posting about it in our Add-ons forum.
What does it mean if an add-on is "experimental" or "preliminarily reviewed"?
Experimental add-ons have been checked by our editors to make sure they don't have security problems, but they may still have bugs or not work properly. Use caution when installing experimental add-ons and uninstall the add-on immediately if you notice problems. Learn more about our review process
What does it mean if an add-on is "not reviewed"?
While all add-ons publicly available in our gallery are reviewed by an editor, you may receive a direct link to an add-on that hasn't yet been reviewed. Use caution when installing these add-ons, as they could harm your computer or violate your privacy. We recommend that you only install reviewed add-ons. Learn more about our review process
How much do add-ons cost to purchase?
Add-ons hosted in our gallery are free unless clearly marked otherwise.
What does it mean when an add-on asks for contributions?
Some add-on authors request users who enjoy an add-on to contribute to its development by making a monetary contribution. These contributions go directly to the developer unless a third party is indicated, such as the non-profit Mozilla Foundation.
What are beta add-ons?

Beta add-ons are unreviewed versions which represent the latest work of an add-on author. While different authors have different standards for beta code quality, you should assume that these add-ons are less stable than the general add-on releases.

Please note that when you install an add-on from the "Beta Version" section of an add-on's listing, you will continue to receive updates for that add-on as they become available. Like the initial version you installed, all beta releases are unreviewed by Mozilla and may harm your computer.

What does it mean when an add-on is flagged as slow?
Most add-ons load code and resources at the same time Firefox is starting up. In most cases the impact in start-up time is minimal, but some add-ons can cause a noticeable slowdown.
How do I report an inappropriate or spam user review?
To report a user review of an add-on, log in with your account and visit the add-on's reviews page. Find the review you wish to report, click "Report this review" and select a reason. Our editorial team will investigate the review and take appropriate action.
How do I report a bug or contact the Mozilla Add-ons team?
Please visit our Contact page.
What is a Source Code License?

The source code used to create an add-on is an exclusive copyright of the add-on author, unless otherwise declared in a source code license. Many add-ons on this site have open source licenses that make the source code publicly available for copy and reuse under conditions determined by the author. Most authors choose widely known open source licenses like the GPL or BSD licenses instead of making up their own.

Firefox and other Mozilla software are open source.

Collections and Favorites

What is a collection?
Kokoelmat ovat toisiinsa liittyvien lisäosien ryhmiä, jotka muut käyttäjät ovat luoneet ja jakaneet.
What is the My Favorites collection?
Favorite add-ons are add-ons that you have bookmarked to easily get back to later. You can add an add-on to your favorites collection by clicking "Add to favorites" on its details page.

Mobiilin lisäosat

What are mobile add-ons?
Mobile add-ons work with Firefox for Mobile and add or modify functionality just like desktop add-ons. You can find add-ons that work with Firefox for Mobile in our gallery.

Developer Topics

Please see our Developer FAQ and Developer Hub for answers to add-on developer-related questions.

Still have questions?

For general Firefox support, visit our support website. For general add-on and website questions, visit our forum.