How To Install Xpi File In Firefox
Google Chrome and Mozilla Firefox are the about used web browsers today. One of the most impressive features found on both of those web browsers is the amount of available gratis extensions or add-ons that you can download and install to change the existing behavior of the browser or even add new features such as a FTP client (FireFTP), download manager (DownThemAll!), or advert blocker (Adblock Plus) without requiring a dedicated third party software. Currently there is more than a whopping 12,000 extensions that tin can exist installed on the electric current Firefox.
Although the extensions are very useful, the constant browser updates which are released every month can cause some of the extensions to terminate working if they are programmed to merely run with specific versions of Firefox.
This is actually a prophylactic feature to allow the extension developers to fully test and verify that their extension is compatible with the latest Firefox and not crashing information technology. However at that place are times when it reports that the extension is incompatible with Firefox or you cannot install considering the Add to Firefox button is grayed out with a text maxim not available for Firefox. Here we have 4 ways to forcefulness the installation of incompatible extensions in Firefox.
i. Nightly Tester Tools
The Nightly Tester Tools is an extension for Firefox which has the power to disable add-on compatibility checking. After installing the extension, restart your Firefox spider web browser, press Alt+T to show the menu bar, get to Nightly Tester Tools and select "Forcefulness Addon Compatibility".
Later enabling the strength addon compatibility option, you can now forcefully enable an incompatible addon. Go to the Add-ons Manager window by pressing Ctrl+Shift+A, right click on the incompatible addition and select Enable. Please ignore the the warning bulletin that is shown in the Add-ons Director telling you that the compatibility checking is disabled and you may have incompatible add-ons.
Download Nightly Tester Tools
2. Disable Add-on Compatibility Checks
On older versions of Firefox, it is possible to easily disable addition compatibility checks past but toggling the extensions.checkCompatibility preference from the nearly:config to faux. All the same since version 3.vi, Firefox requires you lot to include the application version at the end of the preference. This would exist an inconvenience considering Firefox is updated every month which means you'll need to recreate a new preference name on every major release.
To get through this problem, an addon called Disable Improver Compatibility Checks can be used to reinstate the retired extensions.checkCompatibility preference without respect to the current application version. Install the addon and there'due south nothing to configure.
Download Disable Add-on Compatibility Checks
three. Editing Extensions.checkCompatibility Preference
If you belong to the advanced user group who would prefer to acquire how to manually alter the Extensions.checkCompatibility preference to disable the extension compatibility checking, hither are the steps.
3a) First you need to identify the version of Firefox that you're running. You tin either view information technology in Virtually Firefox from the Assistance carte bar or visit the internal URL almost: or nigh:back up.
3b) Access the URL near:config from the address bar and click "I'll be careful, I promise!" button.
3c) Right click in the window, go to New and select Boolean.
3d) When asked to enter the preference name, blazon extensions.checkCompatibility.31.0 and click OK. Y'all may need to supervene upon the 31.0 with the version number that you see from stride 3a.
3e) Select "false" as the boolean value and click OK.
The changes take event immediately without requiring you to restart Firefox. Take note that you'll need to recreate a new preference proper noun of extensions.checkCompatibility with the current version number whenever Firefox is updated.
4. Hacking the Extension
Y'all can find an instruction on the minimum and maximum version number of Firefox that the extension can be installed on and this value is added by the extension developer. Fortunately it is possible to edit the extension and increase the maximum version number so that fifty-fifty the outdated extension tin can be installed on a newer version of Firefox.
4a) Go to the webpage of the extension that you would like to install. Right click on the grayed out "Add to Firefox" button and select "Save Link As…". Firefox will now download the improver file which has a .XPI extension.
4b) Locate the XPI file that y'all've downloaded, correct click on information technology and open with vii-Zip.
4c) In 7-Zip, correct click on the install.rdf file and select Edit. It is advisable to use a better text editor such as Notepad++ to edit the install.rdf file because Windows Notepad does non recognize new line breaks. You'll need to configure 7-Zip to utilise Notepad++ as the default editor from Tools > Options > Editor tab.
4d) Locate the lawmaking in the text editor and take notation of the value for maxVersion. As you can see from the screenshot below, this extension tin can only be installed on Firefox starting from version 1.0 up to 3.1b2pre. Simply change the maxVersion value to a number that is equivalent or college than the current version and save the changes.
4e) 7-Zip volition detect that the install.rdf file was modified and will prompt yous if you want to update it in the annal. Click the OK push button.
4f) The concluding pace is to elevate the modified XPI file onto the Firefox window and will prompt you to install instead of telling you that the extension could not be installed because it is not uniform with Firefox.
Source: https://www.raymond.cc/blog/enable-firefox-incompatible-add-ons-and-this-add-on-is-for-older-versions-of-firefox/
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